Interleukin-3 (IL-3) mutant polypeptides

Cultured stem cells obtained by a method for selective ex-vivo expansion of stem cells, comprising the steps of;

• (a) separating stem cells from other cells;
• (b) culturing the separated stem cells with a selected media which comprises;
• a human interleukin-3 mutant polypeptide of the Formula:
• 44 Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa [SEQ ID NO:19] 1 5 10 15 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Xaa Xaa Xaa Gln Gln 110
• wherein
• Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;
• Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 22 is Asp, Leu, or Val;
• Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 24 is Asn, or Ala;
• Xaa at position 26 is Leu, Trp, or Arg;
• Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;
• Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;
• Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;
• Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 43 is Asn or Gly;
• Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;
• Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 71 is Leu, Asn, Val, or Gln;
• Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 73 is Leu, Ser, Trp, or Gly;
• Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;
• Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;
• Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;
• Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 89 is Asp, or Ser;
• Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;
• Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;
• Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1);
• and
• (c) harvesting said cultured cells.

A method of human gene therapy, comprising the steps of;

• (a) culturing said separated stem cells with a selected media comprising;
• a human interleukin-3 mutant polypeptide of the Formula:
• 47 Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn [SEQ ID NO:15] 1 5 10 15 Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 110 115 120 Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 125 130
• wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;
• Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 36 is Asp, Leu, or Val;
• Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 38 is Asn, or Ala;
• Xaa at position 40 is Leu, Trp, or Arg;
• Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;
• Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;
• Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;
• Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 57 is Asn or Gly;
• Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;
• Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 85 is Leu, Asn, Val, or Gln;
• Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 87 is Leu, Ser, Trp, or Gly;
• Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;
• Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;
• Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;
• Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 103 is Asp, or Ser;
• Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;
• Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;
• Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1);
• (d) harvesting said cultured cells;
• and
• (e) transplanting said cultured cells into said patient.

A method of human gene therapy, comprising the steps of;

• (a) culturing said separated stem cells with a selected media comprising;
• a human interleukin-3 mutant polypeptide of the Formula:
• 48 Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa [SEQ ID NO:19] 1 5 10 15 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Xaa Xaa Xaa Gln Gln 110
• wherein
• Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;
• Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 22 is Asp, Leu, or Val;
• Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 24 is Asn, or Ala;
• Xaa at position 26 is Leu, Trp, or Arg;
• Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;
• Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;
• Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;
• Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 43 is Asn or Gly;
• Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;
• Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 71 is Leu, Asn, Val, or Gln;
• Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 73 is Leu, Ser, Trp, or Gly;
• Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;
• Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;
• Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;
• Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 89 is Asp, or Ser;
• Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;
• Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;
• Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1);
• (d) harvesting said cultured cells;
• and
• (e) transplanting said cultured cells into said patient.

A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide of the Formula:

• 51 Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn [SEQ ID NO:15] 1 5 10 15 Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 110 115 120 Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 125 130
• wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;
• Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 36 is Asp, Leu, or Val;
• Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 38 is Asn, or Ala;
• Xaa at position 40 is Leu, Trp, or Arg;
• Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;
• Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;
• Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;
• Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 57 is Asn or Gly;
• Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;
• Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 85 is Leu, Asn, Val, or Gln;
• Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 87 is Leu, Ser, Trp, or Gly;
• Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;
• Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;
• Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;
• Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 103 is Asp, or Ser;
• Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;
• Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;
• Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1).

A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide of the Formula:

• 52 Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa [SEQ ID NO:19] 1 5 10 15 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Xaa Xaa Xaa Gln Gln 110
• wherein
• Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;
• Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 22 is Asp, Leu, or Val;
• Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 24 is Asn, or Ala;
• Xaa at position 26 is Leu, Trp, or Arg;
• Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;
• Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;
• Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;
• Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 43 is Asn or Gly;
• Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;
• Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 71 is Leu, Asn, Val, or Gln;
• Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 73 is Leu, Ser, Trp, or Gly;
• Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;
• Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;
• Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;
• Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 89 is Asp, or Ser;
• Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;
• Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;
• Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1).

A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide is of the Formula:

• 53 1 5 10 [SEQ ID NO:129] (Met)m-Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr 15 20 Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 25 30 35 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 40 45 50 Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 55 60 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 65 70 75 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 80 85 Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 90 95 100 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 105 110 115 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 120 125 Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 130 Ser Leu Ala Ile Phe
• wherein m is 0 or 1;
• Xaa at position 18 is Asn or Ile;
• Xaa at position 19 is Met, Ala or Ile;
• Xaa at position 20 is Ile, Pro or Leu;
• Xaa at position 23 is Ile, Ala or Leu;
• Xaa at position 25 is Thr or His;
• Xaa at position 29 is Gln, Arg, Val or Ile;
• Xaa at position 32 is Leu, Ala, Asn or Arg;
• Xaa at position 34 is Leu or Ser;
• Xaa at position 37 is Phe, Pro, or Ser;
• Xaa at position 38 is Asn or Ala;
• Xaa at position 42 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 45 is Gln, Val, or Met;
• Xaa at position 46 is Asp or Ser;
• Xaa at position 49 is Met, Ile, Leu or Asp;
• Xaa at position 50 is Glu or Asp;
• Xaa at position 51 is Asn Arg or Ser;
• Xaa at position 55 is Arg, Leu, or Thr;
• Xaa at position 56 is Pro or Ser;
• Xaa at position 59 is Glu or Leu;
• Xaa at position 60 is Ala or Ser;
• Xaa at position 62 is Asn, Val or Pro;
• Xaa at position 63 is Arg or His;
• Xaa at position 65 is Val or Ser;
• Xaa at position 67 is Ser, Asn, His or Gln;
• Xaa at position 69 is Gln or Glu;
• Xaa at position 73 is Ala or Gly;
• Xaa at position 76 is Ser, Ala or Pro;
• Xaa at position 79 is Lys, Arg or Ser;
• Xaa at position 82 is Leu, Glu, Val or Trp;
• Xaa at position 85 is Leu or Val;
• Xaa at position 87 is Leu, Ser, Tyr;
• Xaa at position 88 is Ala or Trp;
• Xaa at position 91 is Ala or Pro;
• Xaa at position 93 is Pro or Ser;
• Xaa at position 95 is His or Thr;
• Xaa at position 98 is His, Ile, or Thr;
• Xaa at position 100 is Lys or Arg;
• Xaa at position 101 is Asp, Ala or Met;
• Xaa at position 105 is Asn or Glu;
• Xaa at position 109 is Arg, Glu or Leu;
• Xaa at position 112 is Thr or Gln;
• Xaa at position 116 is Lys, Val, Trp or Ser;
• Xaa at position 117 is Thr or Ser;
• Xaa at position 120 is Asn, Gln, or His;
• Xaa at position 123 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.

A replicatable vector comprising a nucleic acid molecule encoding a human interleukin-3 mutant polypeptide is of the Formula:

• 54 1 5 10 [SEQ ID NO:130] (Metm-Alan)p-Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile 15 20 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 25 30 35 Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 40 45 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 50 55 60 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 65 70 75 Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 80 85 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 90 95 100 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 105 110 Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln
• wherein m is 0 or 1;
• n is 0 or 1;
• p is 0 or 1;
• Xaa at position 4 is Asn or Ile;
• Xaa at position 5 is Met, Ala or Ile:
• Xaa at position 6 is Ile, Pro or Leu;
• Xaa at position 9 is Ile, Ala or Leu;
• Xaa at position 11 is Thr or His;
• Xaa at position 15 is Gln, Arg, Val or Ile;
• Xaa at position 18 is Leu, Ala, Asn or Arg;
• Xaa at position 20 is Leu or Ser;
• Xaa at position 23 is Phe, Pro, or Ser;
• Xaa at position 24 is Asn or Ala;
• Xaa at position 28 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 31 is Gln, Val, or Met;
• Xaa at position 32 is Asp or Ser;
• Xaa at position 35 is Met, Ile or Asp;
• Xaa at position 36 is Glu or Asp;
• Xaa at position 37 is Asn, Arg or Ser;
• Xaa at position 41 is Arg, Leu, or Thr;
• Xaa at position 42 is Pro or Ser;
• Xaa at position 45 is Glu or Leu;
• Xaa at position 46 is Ala or Ser;
• Xaa at position 48 is Asn, Val or Pro;
• Xaa at position 49 is Arg or His;
• Xaa at position 51 is Val or Ser;
• Xaa at position 53 is Ser, Asn, His or Gln;
• Xaa at position 55 is Gln or Glu;
• Xaa at position 59 is Ala or Gly;
• Xaa at position 62 is Ser, Ala or Pro;
• Xaa at position 65 is Lys, Arg or Ser;
• Xaa at position 67 is Leu, Glu, or Val;
• Xaa at position 68 is Leu, Glu, Val or Trp;
• Xaa at position 71 is Leu or Val;
• Xaa at position 73 is Leu, Ser or Tyr;
• Xaa at position 74 is Ala or Trp;
• Xaa at position 77 is Ala or Pro;
• Xaa at position 79 is Pro or Ser;
• Xaa at position 81 is His or Thr;
• Xaa at position 84 is His, Ile, or Thr;
• Xaa at position 86 is Lys or Arg;
• Xaa at position 87 is Asp, Ala or Met;
• Xaa at position 91 is Asn or Glu;
• Xaa at position 95 is Arg, Glu Leu;
• Xaa at position 98 Thr or Gln;
• Xaa at position 102 is Lys, Val, Trp or Ser;
• Xaa at position 103 is Thr or Ser;
• Xaa at position 106 is Asn, Gln, or His;
• Xaa at position 109 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide of the Formula:

• 55 Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn [SEQ ID NO:15] 1 5 10 15 Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 110 115 120 Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 125 130
• wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;
• Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 36 is Asp, Leu, or Val;
• Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 38 is Asn, or Ala;
• Xaa at position 40 is Leu, Trp, or Arg;
• Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;
• Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;
• Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;
• Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 57 is Asn or Gly;
• Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;
• Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 85 is Leu, Asn, Val, or Gln;
• Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 87 is Leu, Ser, Trp, or Gly;
• Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;
• Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;
• Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;
• Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 103 is Asp, or Ser;
• Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;
• Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;
• Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1).

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide of the Formula:

• 56 Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa [SEQ ID NO:19] 1 5 10 15 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Xaa Xaa Xaa Gln Gln 110
• wherein
• Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;
• Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 22 is Asp, Leu, or Val;
• Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 24 is Asn, or Ala;
• Xaa at position 26 is Leu, Trp, or Arg;
• Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;
• Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;
• Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;
• Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 43 is Asn or Gly;
• Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;
• Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 71 is Leu, Asn, Val, or Gln;
• Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 73 is Leu, Ser, Trp, or Gly;
• Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;
• Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;
• Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;
• Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 89 is Asp, or Ser;
• Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;
• Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;
• Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1).

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide is of the Formula:

• 57 1 5 10 (Met)m-Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr [SEQ ID NO:129] 15 20 Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 25 30 35 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 40 45 50 Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 55 60 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 65 70 75 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 80 85 Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 90 95 100 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 105 110 115 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 120 125 Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 130 Ser Leu Ala Ile Phe
• wherein m is 0 or 1;
• Xaa at position 18 is Asn or Ile;
• Xaa at position 19 is Met, Ala or Ile;
• Xaa at position 20 is Ile, Pro or Leu;
• Xaa at position 23 is Ile, Ala or Leu;
• Xaa at position 25 is Thr or His;
• Xaa at position 29 is Gln, Arg, Val or Ile;
• Xaa at position 32 is Leu, Ala, Asn or Arg;
• Xaa at position 34 is Leu or Ser;
• Xaa at position 37 is Phe, Pro, or Ser;
• Xaa at position 38 is Asn or Ala;
• Xaa at position 42 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 45 is Gln, Val, or Met;
• Xaa at position 46 is Asp or Ser;
• Xaa at position 49 is Met, Ile, Leu or Asp;
• Xaa at position 50 is Glu or Asp;
• Xaa at position 51 is Asn Arg or Ser;
• Xaa at position 55 is Arg, Leu, or Thr;
• Xaa at position 56 is Pro or Ser;
• Xaa at position 59 is Glu or Leu;
• Xaa at position 60 is Ala or Ser;
• Xaa at position 62 is Asn, Val or Pro;
• Xaa at position 63 is Arg or His;
• Xaa at position 65 is Val or Ser;
• Xaa at position 67 is Ser, Asn, His or Gln;
• Xaa at position 69 is Gln or Glu;
• Xaa at position 73 is Ala or Gly;
• Xaa at position 76 is Ser, Ala or Pro;
• Xaa at position 79 is Lys, Arg or Ser;
• Xaa at position 82 is Leu, Glu, Val or Trp;
• Xaa at position 85 is Leu or Val;
• Xaa at position 87 is Leu, Ser, Tyr;
• Xaa at position 88 is Ala or Trp;
• Xaa at position 91 is Ala or Pro;
• Xaa at position 93 is Pro or Ser;
• Xaa at position 95 is His or Thr;
• Xaa at position 98 is His, Ile, or Thr;
• Xaa at position 100 is Lys or Arg;
• Xaa at position 101 is Asp, Ala or Met;
• Xaa at position 105 is Asn or Glu;
• Xaa at position 109 is Arg, Glu or Leu;
• Xaa at position 112 is Thr or Gln;
• Xaa at position 116 is Lys, Val, Trp or Ser;
• Xaa at position 117 is Thr or Ser;
• Xaa at position 120 is Asn, Gln, or His;
• Xaa at position 123 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a human interleukin-3 mutant polypeptide is of the Formula:

• 58 1 5 10 (Metm-Alan)p-Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile [SEQ ID NO:130] 15 20 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 25 30 35 Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 40 45 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 50 55 60 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 65 70 75 Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 80 85 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 90 95 100 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 105 110 Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln
• wherein m is 0 or 1;
• n is 0 or 1;
• p is 0 or 1;
• Xaa at position 4 is Asn or Ile;
• Xaa at position 5 is Met, Ala or Ile:
• Xaa at position 6 is Ile, Pro or Leu;
• Xaa at position 9 is Ile, Ala or Leu;
• Xaa at position 11 is Thr or His;
• Xaa at position 15 is Gln, Arg, Val or Ile;
• Xaa at position 18 is Leu, Ala, Asn or Arg;
• Xaa at position 20 is Leu or Ser;
• Xaa at position 23 is Phe, Pro, or Ser;
• Xaa at position 24 is Asn or Ala;
• Xaa at position 28 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 31 is Gln, Val, or Met;
• Xaa at position 32 is Asp or Ser;
• Xaa at position 35 is Met, Ile or Asp;
• Xaa at position 36 is Glu or Asp;
• Xaa at position 37 is Asn, Arg or Ser;
• Xaa at position 41 is Arg, Leu, or Thr;
• Xaa at position 42 is Pro or Ser;
• Xaa at position 45 is Glu or Leu;
• Xaa at position 46 is Ala or Ser;
• Xaa at position 48 is Asn, Val or Pro;
• Xaa at position 49 is Arg or His;
• Xaa at position 51 is Val or Ser;
• Xaa at position 53 is Ser, Asn, His or Gln;
• Xaa at position 55 is Gln or Glu;
• Xaa at position 59 is Ala or Gly;
• Xaa at position 62 is Ser, Ala or Pro;
• Xaa at position 65 is Lys, Arg or Ser;
• Xaa at position 67 is Leu, Glu, or Val;
• Xaa at position 68 is Leu, Glu, Val or Trp;
• Xaa at position 71 is Leu or Val;
• Xaa at position 73 is Leu, Ser or Tyr;
• Xaa at position 74 is Ala or Trp;
• Xaa at position 77 is Ala or Pro;
• Xaa at position 79 is Pro or Ser;
• Xaa at position 81 is His or Thr;
• Xaa at position 84 is His, Ile, or Thr;
• Xaa at position 86 is Lys or Arg;
• Xaa at position 87 is Asp, Ala or Met;
• Xaa at position 91 is Asn or Glu;
• Xaa at position 95 is Arg, Glu Leu;
• Xaa at position 98 Thr or Gln;
• Xaa at position 102 is Lys, Val, Trp or Ser;
• Xaa at position 103 is Thr or Ser;
• Xaa at position 106 is Asn, Gln, or His;
• Xaa at position 109 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising a human interleukin-3 mutant polypeptide of the Formula and a pharmaceutically acceptable carrier:

• 59 Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn [SEQ ID NO:15] 1 5 10 15 Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 110 115 120 Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 125 130
• wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;
• Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 36 is Asp, Leu, or Val;
• Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 38 is Asn, or Ala;
• Xaa at position 40 is Leu, Trp, or Arg;
• Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;
• Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;
• Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 44 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;
• Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 57 is Asn or Gly;
• Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;
• Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 85 is Leu, Asn, Val, or Gln;
• Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 87 is Leu, Ser, Trp, or Gly;
• Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;
• Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;
• Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;
• Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 103 is Asp, or Ser;
• Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;
• Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;
• Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1).

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising a human interleukin-3 mutant polypeptide of the Formula and a pharmaceutically acceptable carrier:

• 60 Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa [SEQ ID NO:19] 1 5 10 15 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Xaa Xaa Xaa Gln Gln 110
• wherein
• Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;
• Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 22 is Asp, Leu, or Val;
• Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 24 is Asn, or Ala;
• Xaa at position 26 is Leu, Trp, or Arg;
• Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;
• Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;
• Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;
• Xaa at position 32 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 43 is Asn or Gly;
• Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;
• Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 71 is Leu, Asn, Val, or Gln;
• Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 73 is Leu, Ser, Trp, or Gly;
• Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;
• Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;
• Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;
• Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 89 is Asp, or Ser;
• Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;
• Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;
• Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1).

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising human interleukin-3 mutant polypeptide is of the Formula and a pharmaceutically acceptable carrier:

• 61 1 5 10 (Met)m-Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr [SEQ ID NO:129] 15 20 Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 25 30 35 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 40 45 50 Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 55 60 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 65 70 75 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Gln Xaa 80 85 Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 90 95 100 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 105 110 115 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 120 125 Xaa Xaa Leu Gln Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 130 Ser Leu Ala Ile Phe
• wherein m is 0 or 1;
• Xaa at position 18 is Asn or Ile;
• Xaa at position 19 is Met, Ala or Ile;
• Xaa at position 20 is Ile, Pro or Leu;
• Xaa at position 23 is Ile, Ala or Leu;
• Xaa at position 25 is Thr or His;
• Xaa at position 29 is Gln, Arg, Val or Ile;
• Xaa at position 32 is Leu, Ala, Asn or Arg;
• Xaa at position 34 is Leu or Ser;
• Xaa at position 37 is Phe, Pro, or Ser;
• Xaa at position 38 is Asn or Ala;
• Xaa at position 42 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 45 is Gln, Val, or Met;
• Xaa at position 46 is Asp or Ser;
• Xaa at position 49 is Met, Ile, Leu or Asp;
• Xaa at position 50 is Glu or Asp;
• Xaa at position 51 is Asn Arg or Ser;
• Xaa at position 55 is Arg, Leu, or Thr;
• Xaa at position 56 is Pro or Ser;
• Xaa at position 59 is Glu or Leu;
• Xaa at position 60 is Ala or Ser;
• Xaa at position 62 is Asn, Val or Pro;
• Xaa at position 63 is Arg or His;
• Xaa at position 65 is Val or Ser;
• Xaa at position 67 is Ser, Asn, His or Gln;
• Xaa at position 69 is Gln or Glu;
• Xaa at position 73 is Ala or Gly;
• Xaa at position 76 is Ser, Ala or Pro;
• Xaa at position 79 is Lys, Arg or Ser;
• Xaa at position 82 is Leu, Glu, Val or Trp;
• Xaa at position 85 is Leu or Val;
• Xaa at position 87 is Leu, Ser, Tyr;
• Xaa at position 88 is Ala or Trp;
• Xaa at position 91 is Ala or Pro;
• Xaa at position 93 is Pro or Ser;
• Xaa at position 95 is His or Thr;
• Xaa at position 98 is His, Ile, or Thr;
• Xaa at position 100 is Lys or Arg;
• Xaa at position 101 is Asp, Ala or Met;
• Xaa at position 105 is Asn or Glu;
• Xaa at position 109 is Arg, Glu or Leu;
• Xaa at position 112 is Thr or Gln;
• Xaa at position 116 is Lys, Val, Trp or Ser;
• Xaa at position 117 is Thr or Ser;
• Xaa at position 120 is Asn, Gln, or His;
• Xaa at position 123 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.

A method of stimulating the production of hematopoietic cells in a patient comprising the step of administering to said patient a composition comprising human interleukin-3 mutant polypeptide is of the Formula and a pharmaceutically acceptable carrier:

• 62 1 5 10 (Metm-Alan)p-Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile [SEQ ID NO:130] 15 20 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 25 30 35 Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 40 45 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 50 55 60 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 65 70 75 Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 80 85 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 90 95 100 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 105 110 Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln
• wherein m is 0 or 1;
• n is 0 or 1;
• p is 0 or 1;
• Xaa at position 4 is Asn or Ile;
• Xaa at position 5 is Met, Ala or Ile:
• Xaa at position 6 is Ile, Pro or Leu;
• Xaa at position 9 is Ile, Ala or Leu;
• Xaa at position 11 is Thr or His;
• Xaa at position 15 is Gln, Arg, Val or Ile;
• Xaa at position 18 is Leu, Ala, Asn or Arg;
• Xaa at position 20 is Leu or Ser;
• Xaa at position 23 is Phe, Pro, or Ser;
• Xaa at position 24 is Asn or Ala;
• Xaa at position 28 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 31 is Gln, Val, or Met;
• Xaa at position 32 is Asp or Ser;
• Xaa at position 35 is Met, Ile or Asp;
• Xaa at position 36 is Glu or Asp;
• Xaa at position 37 is Asn, Arg or Ser;
• Xaa at position 41 is Arg, Leu, or Thr;
• Xaa at position 42 is Pro or Ser;
• Xaa at position 45 is Glu or Leu;
• Xaa at position 46 is Ala or Ser;
• Xaa at position 48 is Asn, Val or Pro;
• Xaa at position 49 is Arg or His;
• Xaa at position 51 is Val or Ser;
• Xaa at position 53 is Ser, Asn, His or Gln;
• Xaa at position 55 is Gln or Glu;
• Xaa at position 59 is Ala or Gly;
• Xaa at position 62 is Ser, Ala or Pro;
• Xaa at position 65 is Lys, Arg or Ser;
• Xaa at position 67 is Leu, Glu, or Val;
• Xaa at position 68 is Leu, Glu, Val or Trp;
• Xaa at position 71 is Leu or Val;
• Xaa at position 73 is Leu, Ser or Tyr;
• Xaa at position 74 is Ala or Trp;
• Xaa at position 77 is Ala or Pro;
• Xaa at position 79 is Pro or Ser;
• Xaa at position 81 is His or Thr;
• Xaa at position 84 is His, Ile, or Thr;
• Xaa at position 86 is Lys or Arg;
• Xaa at position 87 is Asp, Ala or Met;
• Xaa at position 91 is Asn or Glu;
• Xaa at position 95 is Arg, Glu Leu;
• Xaa at position 98 Thr or Gln;
• Xaa at position 102 is Lys, Val, Trp or Ser;
• Xaa at position 103 is Thr or Ser;
• Xaa at position 106 is Asn, Gln, or His;
• Xaa at position 109 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3.

A method of treating a patient comprising the steps of:

• (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:
• 63 Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr Ser Trp Val Asn [SEQ ID NO:15] 1 5 10 15 Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 110 115 120 Xaa Xaa Xaa Gln Gln Thr Thr Leu Ser Leu Ala Ile Phe 125 130
• wherein Xaa at position 17 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 18 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 19 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 20 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 21 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 22 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val or Gly;
• Xaa at position 23 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 24 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 25 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 26 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 27 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 28 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 29 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 30 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 31 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 32 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 33 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 34 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 35 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 36 is Asp, Leu, or Val;
• Xaa at position 37 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 38 is Asn, or Ala;
• Xaa at position 40 is Leu, Trp, or Arg;
• Xaa at position 41 is Asn, Cys, Arg, Leu, His, Met, or Pro;
• Xaa at position 42 is Gly, Asp, Ser, Cys, Asn, Lys, Thr, Leu, Val, Glu, Phe, Tyr, Ile, Met or Ala;
• Xaa at position 43 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 44 is Asp, Ser, Leu, Arq, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 45 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Trp, Asp, Asn, Arg, Ser, Ala, Ile, Glu or His;
• Xaa at position 46 is Asp, Phe, Ser, Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 47 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 48 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 49 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 50 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 51 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 52 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 53 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 54 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 55 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 56 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 57 is Asn or Gly;
• Xaa at position 58 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 59 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 60 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 61 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 62 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 63 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 64 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 65 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 66 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 67 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 68 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 69 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 70 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 71 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 72 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 73 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 74 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 75 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 76 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 77 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 78 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 79 is Lys, Thr, Asn, Met, Arg, Ile, Gly, or Asp;
• Xaa at position 80 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 81 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 82 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 83 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 84 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 85 is Leu, Asn, Val, or Gln;
• Xaa at position 86 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 87 is Leu, Ser, Trp, or Gly;
• Xaa at position 88 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 89 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 90 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 91 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 92 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 93 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 94 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala, or Pro;
• Xaa at position 95 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile, or Tyr;
• Xaa at position 96 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 97 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 98 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 99 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 100 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 101 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu, or Gln;
• Xaa at position 102 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 103 is Asp, or Ser;
• Xaa at position 104 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 105 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 106 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 108 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala or Pro;
• Xaa at position 109 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 110 is Lys, Ala, Asn, Thr, Leu, Arg, Gln, His, Glu, Ser, or Trp;
• Xaa at position 111 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 112 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 113 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 114 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 115 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 116 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 117 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 118 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 119 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 120 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 121 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 122 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 123 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 14 amino acids can be deleted from the N-terminus and/or from 1 to 15 amino acids can be deleted from the C-terminus;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding amino acids of native (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1);
• (ii) removing hematopoietic cells from said patient;
• (iii) administering to said patient cancer radiation therapy or chemotherapy;
• and
• (iv) returning said hematopoietic cells to said patient.

A method of treating a patient comprising the steps of:

• (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:
• 64 Asn Cys Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa [SEQ ID NO:19] 1 5 10 15 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Asn Xaa Xaa Xaa Xaa Xaa 20 25 30 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 35 40 45 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 50 55 60 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 65 70 75 Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 80 85 90 Xaa Xaa Phe Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa Xaa 95 100 105 Xaa Xaa Xaa Xaa Gln Gln 110
• wherein
• Xaa at position 3 is Ser, Lys, Gly, Asp, Met, Gln, or Arg;
• Xaa at position 4 is Asn, His, Leu, Ile, Phe, Arg, or Gln;
• Xaa at position 5 is Met, Phe, Ile, Arg, Gly, Ala, or Cys;
• Xaa at position 6 is Ile, Cys, Gln, Glu, Arg, Pro, or Ala;
• Xaa at position 7 is Asp, Phe, Lys, Arg, Ala, Gly, Glu, Gln, Asn, Thr, Ser or Val;
• Xaa at position 8 is Glu, Trp, Pro, Ser, Ala, His, Asp, Asn, Gln, Leu, Val, or Gly;
• Xaa at position 9 is Ile, Val, Ala, Leu, Gly, Trp, Lys, Phe, Ser, or Arg;
• Xaa at position 10 is Ile, Gly, Val, Arg, Ser, Phe, or Leu;
• Xaa at position 11 is Thr, His, Gly, Gln, Arg, Pro, or Ala;
• Xaa at position 12 is His, Thr, Phe, Gly, Arg, Ala, or Trp;
• Xaa at position 13 is Leu, Gly, Arg, Thr, Ser, or Ala;
• Xaa at position 14 is Lys, Arg, Leu, Gln, Gly, Pro, Val or Trp;
• Xaa at position 15 is Gln, Asn, Leu, Pro, Arg, or Val;
• Xaa at position 16 is Pro, His, Thr, Gly, Asp, Gln, Ser, Leu, or Lys;
• Xaa at position 17 is Pro, Asp, Gly, Ala, Arg, Leu, or Gln;
• Xaa at position 18 is Leu, Val, Arg, Gln, Asn, Gly, Ala, or Glu;
• Xaa at position 19 is Pro, Leu, Gln, Ala, Thr, or Glu;
• Xaa at position 20 is Leu, Val, Gly, Ser, Lys, Glu, Gln, Thr, Arg, Ala, Phe, Ile or Met;
• Xaa at position 21 is Leu, Ala, Gly, Asn, Pro, Gln, or Val;
• Xaa at position 22 is Asp, Leu, or Val;
• Xaa at position 23 is Phe, Ser, Pro, Trp, or Ile;
• Xaa at position 24 is Asn, or Ala;
• Xaa at position 26 is Leu, Trp, or Arg;
• Xaa at position 27 is Asn, Cys, Arg, Leu, His, Met, Pro;
• Xaa at position 28 is Gly, Asp, Ser, Cys, Ala, Lys, Asn, Thr, Leu, Val, Glu, Phe, Tyr, Ile or Met;
• Xaa at position 29 is Glu, Asn, Tyr, Leu, Phe, Asp, Ala, Cys, Gln, Arg, Thr, Gly or Ser;
• Xaa at position 30 is Asp, Ser, Leu, Arg, Lys, Thr, Met, Trp, Glu, Asn, Gln, Ala or Pro;
• Xaa at position 31 is Gln, Pro, Phe, Val, Met, Leu, Thr, Lys, Asp, Asn, Arg, Ser, Ala, Ile, Glu, His or Trp;
• Xaa at position 32 is Asp, Phe, Ser. Thr, Cys, Glu, Asn, Gln, Lys, His, Ala, Tyr, Ile, Val or Gly;
• Xaa at position 33 is Ile, Gly, Val, Ser, Arg, Pro, or His;
• Xaa at position 34 is Leu, Ser, Cys, Arg, Ile, His, Phe, Glu, Lys, Thr, Ala, Met, Val or Asn;
• Xaa at position 35 is Met, Arg, Ala, Gly, Pro, Asn, His, or Asp;
• Xaa at position 36 is Glu, Leu, Thr, Asp, Tyr, Lys, Asn, Ser, Ala, Ile, Val, His, Phe, Met or Gln;
• Xaa at position 37 is Asn, Arg, Met, Pro, Ser, Thr, or His;
• Xaa at position 38 is Asn, His, Arg, Leu, Gly, Ser, or Thr;
• Xaa at position 39 is Leu, Thr, Ala, Gly, Glu, Pro, Lys, Ser, or Met;
• Xaa at position 40 is Arg, Asp, Ile, Ser, Val, Thr, Gln, Asn, Lys, His, Ala or Leu;
• Xaa at position 41 is Arg, Thr, Val, Ser, Leu, or Gly;
• Xaa at position 42 is Pro, Gly, Cys, Ser, Gln, Glu, Arg, His, Thr, Ala, Tyr, Phe, Leu, Val or Lys;
• Xaa at position 43 is Asn or Gly;
• Xaa at position 44 is Leu, Ser, Asp, Arg, Gln, Val, or Cys;
• Xaa at position 45 is Glu Tyr, His, Leu, Pro, or Arg;
• Xaa at position 46 is Ala, Ser, Pro, Tyr, Asn, or Thr;
• Xaa at position 47 is Phe, Asn, Glu, Pro, Lys, Arg, or Ser;
• Xaa at position 48 is Asn, His, Val, Arg, Pro, Thr, Asp, or Ile;
• Xaa at position 49 is Arg, Tyr, Trp, Lys, Ser, His, Pro, or Val;
• Xaa at position 50 is Ala, Asn, Pro, Ser, or Lys;
• Xaa at position 51 is Val, Thr, Pro, His, Leu, Phe, or Ser;
• Xaa at position 52 is Lys, Ile, Arg, Val, Asn, Glu, or Ser;
• Xaa at position 53 is Ser, Ala, Phe, Val, Gly, Asn, Ile, Pro, or His;
• Xaa at position 54 is Leu, Val, Trp, Ser, Ile, Phe, Thr, or His;
• Xaa at position 55 is Gln, Ala, Pro, Thr, Glu, Arg, Trp, Gly, or Leu;
• Xaa at position 56 is Asn, Leu, Val, Trp, Pro, or Ala;
• Xaa at position 57 is Ala, Met, Leu, Pro, Arg, Glu, Thr, Gln, Trp, or Asn;
• Xaa at position 58 is Ser, Glu, Met, Ala, His, Asn, Arg, or Asp;
• Xaa at position 59 is Ala, Glu, Asp, Leu, Ser, Gly, Thr, or Arg;
• Xaa at position 60 is Ile, Met, Thr, Pro, Arg, Gly, Ala;
• Xaa at position 61 is Glu, Lys, Gly, Asp, Pro, Trp, Arg, Ser, Gln, or Leu;
• Xaa at position 62 is Ser, Val, Ala, Asn, Trp, Glu, Pro, Gly, or Asp;
• Xaa at position 63 is Ile, Ser, Arg, Thr, or Leu;
• Xaa at position 64 is Leu, Ala, Ser, Glu, Phe, Gly, or Arg;
• Xaa at position 65 is Lys, Thr, Gly, Asn, Met, Arg, Ile, or Asp;
• Xaa at position 66 is Asn, Trp, Val, Gly, Thr, Leu, Glu, or Arg;
• Xaa at position 67 is Leu, Gln, Gly, Ala, Trp, Arg, Val, or Lys;
• Xaa at position 68 is Leu, Gln, Lys, Trp, Arg, Asp, Glu, Asn, His, Thr, Ser, Ala, Tyr, Phe, Ile, Met or Val;
• Xaa at position 69 is Pro, Ala, Thr, Trp, Arg, or Met;
• Xaa at position 70 is Cys, Glu, Gly, Arg, Met, or Val;
• Xaa at position 71 is Leu, Asn, Val, or Gln;
• Xaa at position 72 is Pro, Cys, Arg, Ala, or Lys;
• Xaa at position 73 is Leu, Ser, Trp, or Gly;
• Xaa at position 74 is Ala, Lys, Arg, Val, or Trp;
• Xaa at position 75 is Thr, Asp, Cys, Leu, Val, Glu, His, Asn, or Ser;
• Xaa at position 76 is Ala, Pro, Ser, Thr, Gly, Asp, Ile, or Met;
• Xaa at position 77 is Ala, Pro, Ser, Thr, Phe, Leu, Asp, or His;
• Xaa at position 78 is Pro, Phe, Arg, Ser, Lys, His, Ala, Gly, Ile or Leu;
• Xaa at position 79 is Thr, Asp, Ser, Asn, Pro, Ala, Leu, or Arg;
• Xaa at position 80 is Arg, Ile, Ser, Glu, Leu, Val, Gln, Lys, His, Ala or Pro;
• Xaa at position 81 is His, Gln, Pro, Arg, Val, Leu, Gly, Thr, Asn, Lys, Ser, Ala, Trp, Phe, Ile or Tyr;
• Xaa at position 82 is Pro, Lys, Tyr, Gly, Ile, or Thr;
• Xaa at position 83 is Ile, Val, Lys, Ala, or Asn;
• Xaa at position 84 is His, Ile, Asn, Leu, Asp, Ala, Thr, Glu, Gln, Ser, Phe, Met, Val, Lys, Arg, Tyr or Pro;
• Xaa at position 85 is Ile, Leu, Arg, Asp, Val, Pro, Gln, Gly, Ser, Phe, or His;
• Xaa at position 86 is Lys, Tyr, Leu, His, Arg, Ile, Ser, Gln, or Pro;
• Xaa at position 87 is Asp, Pro, Met, Lys, His, Thr, Val, Tyr, Glu, Asn, Ser, Ala, Gly, Ile, Leu or Gln;
• Xaa at position 88 is Gly, Leu, Glu, Lys, Ser, Tyr, or Pro;
• Xaa at position 89 is Asp, or Ser;
• Xaa at position 90 is Trp, Val, Cys, Tyr, Thr, Met, Pro, Leu, Gln, Lys, Ala, Phe, or Gly;
• Xaa at position 91 is Asn, Pro, Ala, Phe, Ser, Trp, Gln, Tyr, Leu, Lys, Ile, Asp, or His;
• Xaa at position 92 is Glu, Ser, Ala, Lys, Thr, Ile, Gly, or Pro;
• Xaa at position 94 is Arg, Lys, Asp, Leu, Thr, Ile, Gln, His, Ser, Ala, or Pro;
• Xaa at position 95 is Arg, Thr, Pro, Glu, Tyr, Leu, Ser, or Gly;
• Xaa at position 96 is Lys, Asn, Thr, Leu, Gln, Arg, His, Glu, Ser, Ala or Trp;
• Xaa at position 97 is Leu, Ile, Arg, Asp, or Met;
• Xaa at position 98 is Thr, Val, Gln, Tyr, Glu, His, Ser, or Phe;
• Xaa at position 99 is Phe, Ser, Cys, His, Gly, Trp, Tyr, Asp, Lys, Leu, Ile, Val or Asn;
• Xaa at position 100 is Tyr, Cys, His, Ser, Trp, Arg, or Leu;
• Xaa at position 101 is Leu, Asn, Val, Pro, Arg, Ala, His, Thr, Trp, or Met;
• Xaa at position 102 is Lys, Leu, Pro, Thr, Met, Asp, Val, Glu, Arg, Trp, Ser, Asn, His, Ala, Tyr, Phe, Gln, or Ile;
• Xaa at position 103 is Thr, Ser, Asn, Ile, Trp, Lys, or Pro;
• Xaa at position 104 is Leu, Ser, Pro, Ala, Glu, Cys, Asp, or Tyr;
• Xaa at position 105 is Glu, Ser, Lys, Pro, Leu, Thr, Tyr, or Arg;
• Xaa at position 106 is Asn, Ala, Pro, Leu, His, Val, or Gln;
• Xaa at position 107 is Ala, Ser, Ile, Asn, Pro, Lys, Asp, or Gly;
• Xaa at position 108 is Gln, Ser, Met, Trp, Arg, Phe, Pro, His, Ile, Tyr, or Cys;
• Xaa at position 109 is Ala, Met, Glu, His, Ser, Pro, Tyr, or Leu;
• and wherein from 1 to 3 of the amino acids designated by Xaa are different from the corresponding native amino acids of (1-133) human interleukin-3;
• and which can additionally be preceded by (methionine−1), (alanine−1) or (methionine−2, alanine−1);
• (ii) removing hematopoietic cells from said patient;
• (iii) administering to said patient cancer radiation therapy or chemotherapy;
• and
• (iv) returning said hematopoietic cells to said patient.

A method of treating a patient comprising the steps of:

• (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:
• 65 1 5 10 (Met)m-Ala Pro Met Thr Gln Thr Thr Ser Leu Lys Thr [SEQ ID NO:129] 15 20 Ser Trp Val Asn Cys Ser Xaa Xaa Xaa Asp Glu Ile Ile 25 30 35 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 40 45 50 Xaa Asn Leu Asn Xaa Glu Asp Xaa Asp Ile Leu Xaa Glu 55 60 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 65 70 75 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 80 85 Ile Leu Xaa Asn Leu Xaa Pro Cys Xaa Pro Xaa Xaa Thr 90 95 100 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 105 110 115 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 120 125 Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln Thr Thr Leu 130 Ser Leu Ala Ile Phe
• wherein m is 0 or 1;
• Xaa at position 18 is Asn or Ile;
• Xaa at position 19 is Met, Ala or Ile;
• Xaa at position 20 is Ile, Pro or Leu;
• Xaa at position 23 is Ile, Ala or Leu;
• Xaa at position 25 is Thr or His;
• Xaa at position 29 is Gln, Arg, Val or Ile;
• Xaa at position 32 is Leu, Ala, Asn or Arg;
• Xaa at position 34 is Leu or Ser;
• Xaa at position 37 is Phe, Pro, or Ser;
• Xaa at position 38 is Asn or Ala;
• Xaa at position 42 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 45 is Gln, Val, or Met;
• Xaa at position 46 is Asp or Ser;
• Xaa at position 49 is Met, Ile, Leu or Asp;
• Xaa at position 50 is Glu or Asp;
• Xaa at position 51 is Asn Arg or Ser;
• Xaa at position 55 is Arg, Leu, or Thr;
• Xaa at position 56 is Pro or Ser;
• Xaa at position 59 is Glu or Leu;
• Xaa at position 60 is Ala or Ser;
• Xaa at position 62 is Asn, Val or Pro;
• Xaa at position 63 is Arg or His;
• Xaa at position 65 is Val or Ser;
• Xaa at position 67 is Ser, Asn, His or Gln;
• Xaa at position 69 is Gln or Glu;
• Xaa at position 73 is Ala or Gly;
• Xaa at position 76 is Ser, Ala or Pro;
• Xaa at position 79 is Lys, Arg or Ser;
• Xaa at position 82 is Leu, Glu, Val or Trp;
• Xaa at position 85 is Leu or Val;
• Xaa at position 87 is Leu, Ser, Tyr;
• Xaa at position 88 is Ala or Trp;
• Xaa at position 91 is Ala or Pro;
• Xaa at position 93 is Pro or Ser;
• Xaa at position 95 is His or Thr;
• Xaa at position 98 is His, Ile, or Thr;
• Xaa at position 100 is Lys or Arg;
• Xaa at position 101 is Asp, Ala or Met;
• Xaa at position 105 is Asn or Glu;
• Xaa at position 109 is Arg, Glu or Leu;
• Xaa at position 112 is Thr or Gln;
• Xaa at position 116 is Lys, Val, Trp or Ser;
• Xaa at position 117 is Thr or Ser;
• Xaa at position 120 is Asn, Gln, or His;
• Xaa at position 123 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interieukin-3;
• (ii) removing hematopoietic cells from said patient;
• (iii) administering to said patient cancer radiation therapy or chemotherapy;
• and
• (iv) returning said hematopoietic cells to said patient.

A method of treating a patient comprising the steps of:

• (i) administering to said patient, an amount of a mutant human interleukin-3 (IL-3) polypeptide, effective to promote the proliferation and/or differentiation of hematopoietic cells in said patient, wherein said mutant human interleukin-3 (hIL-3) polypeptide comprises:
• 66 1 5 10 (Metm-Alan)p-Asn Cys Ser Xaa Xaa Xaa Asp Glu Xaa Ile [SEQ ID NO:130] 15 20 Xaa His Leu Lys Xaa Pro Pro Xaa Pro Xaa Leu Asp Xaa 25 30 35 Xaa Asn Leu Asn Xaa Glu Asp Xaa Xaa Ile Leu Xaa Glu 40 45 Xaa Asn Leu Arg Xaa Xaa Asn Leu Xaa Xaa Phe Xaa Xaa 50 55 60 Ala Xaa Lys Xaa Leu Xaa Asn Ala Ser Xaa Ile Glu Xaa 65 70 75 Ile Leu Xaa Asn Xaa Xaa Pro Cys Xaa Pro Xaa Ala Thr 80 85 Ala Xaa Pro Xaa Arg Xaa Pro Ile Xaa Ile Xaa Xaa Gly 90 95 100 Asp Trp Xaa Glu Phe Arg Xaa Lys Leu Xaa Phe Tyr Leu 105 110 Xaa Xaa Leu Glu Xaa Ala Gln Xaa Gln Gln
• wherein m is 0 or 1;
• n is 0 or 1;
• p is 0 or 1;
• Xaa at position 4 is Asn or Ile;
• Xaa at position 5 is Met, Ala or Ile:
• Xaa at position 6 is Ile, Pro or Leu;
• Xaa at position 9 is Ile, Ala or Leu;
• Xaa at position 11 is Thr or His;
• Xaa at position 15 is Gln, Arg, Val or Ile;
• Xaa at position 18 is Leu, Ala, Asn or Arg;
• Xaa at position 20 is Leu or Ser;
• Xaa at position 23 is Phe, Pro, or Ser;
• Xaa at position 24 is Asn or Ala;
• Xaa at position 28 is Gly, Ala, Ser, Asp or Asn;
• Xaa at position 31 is Gln, Val, or Met;
• Xaa at position 32 is Asp or Ser;
• Xaa at position 35 is Met, Ile or Asp;
• Xaa at position 36 is Glu or Asp;
• Xaa at position 37 is Asn, Arg or Ser;
• Xaa at position 41 is Arg, Leu, or Thr;
• Xaa at position 42 is Pro or Ser;
• Xaa at position 45 is Glu or Leu;
• Xaa at position 46 is Ala or Ser;
• Xaa at position 48 is Asn, Val or Pro;
• Xaa at position 49 is Arg or His;
• Xaa at position 51 is Val or Ser;
• Xaa at position 53 is Ser, Asn, His or Gln;
• Xaa at position 55 is Gln or Glu;
• Xaa at position 59 is Ala or Gly;
• Xaa at position 62 is Ser, Ala or Pro;
• Xaa at position 65 is Lys, Arg or Ser;
• Xaa at position 67 is Leu, Glu, or Val;
• Xaa at position 68 is Leu, Glu, Val or Trp;
• Xaa at position 71 is Leu or Val;
• Xaa at position 73 is Leu, Ser or Tyr;
• Xaa at position 74 is Ala or Trp;
• Xaa at position 77 is Ala or Pro;
• Xaa at position 79 is Pro or Ser;
• Xaa at position 81 is His or Thr;
• Xaa at position 84 is His, Ile, or Thr;
• Xaa at position 86 is Lys or Arg;
• Xaa at position 87 is Asp, Ala or Met;
• Xaa at position 91 is Asn or Glu;
• Xaa at position 95 is Arg, Glu Leu;
• Xaa at position 98 Thr or Gln;
• Xaa at position 102 is Lys, Val, Trp or Ser;
• Xaa at position 103 is Thr or Ser;
• Xaa at position 106 is Asn, Gln, or His;
• Xaa at position 109 is Ala or Glu;
• with the proviso that from one to three of the amino acids designated by Xaa are different from the corresponding amino acids of native human interleukin-3;
• (ii) removing hematopoietic cells from said patient;
• (iii) administering to said patient cancer radiation therapy or chemotherapy;
• and
• (iv) returning said hematopoietic cells to said patient.