An isolated or purified antibody (Ab), or synthetic or recombinant Ab, or antigen (Ag) binding fragment thereof, or monomeric or dimeric antigen binding protein (ABP), capable of specifically binding a human homeobox NKX-2.1 (also called NK2 homeobox 1, or thyroid transcription factor 1 (TTF-1)) protein or polypeptide,
- wherein the isolated or purified Ab, or synthetic or recombinant Ab, or Ag binding fragment thereof, or monomeric or dimeric ABP comprises:
- (a) a heavy chain variable region (VH) capable of specifically binding to a human homeobox NKX-2.1 protein or polypeptide, comprising:
- (1) an amino acid sequence comprising the three CDR1, CDR2 and CDR3 complementarity determining regions (CDRs) of SEQ ID NO:1, or CDR1 amino acid (aa) residues GFSLSSYA (residues 25 to 32 of SEQ ID NO:1), CDR2 aa residues INSYGNA (residues 50 to 56 of SEQ ID NO:1), and CDR3 aa residues TTTHSYGFGAFDP (residues 95 to 107 of SEQ ID NO:1), or
- (2) amino acid sequences having at least about 70%, 75%, 80%, 85%, 90%, 95%, 98% sequence identity, or between about 70% to 100% sequence identity, to each of the three CDR1, CDR2 and CDR3 complementarity determining regions (CDRs) of SEQ ID NO:1, or CDR1 amino acid (aa) residues GFSLSSYA (residues 25 to 32 of SEQ ID NO:1), CDR2 aa residues INSYGNA (residues 50 to 56 of SEQ ID NO:1), and CDR3 aa residues TTTHSYGFGAFDP (residues 95 to 107 of SEQ ID NO:1), or
- (3) an amino acid sequence having at least about 70%, 75%, 80%, 85%, 90%, 95%, 98% sequence identity, or between about 70% to 100% sequence identity, to SEQ ID NO:1, or an amino acid sequence having complete sequence identity to SEQ ID NO:1;
- (b) a light chain variable region (VL) capable of specifically bind to a human homeobox NKX-2.1 protein or polypeptide comprising:
- (1) an amino acid sequence comprising the three CDR1, CDR2 and CDR3 complementarity determining regions (CDRs) of SEQ ID NO:2, or CDR1 amino acid (aa) residues ESAYNNR (residues 27 to 33 of SEQ ID NO:2), CDR2 aa residues DAS (residues 51 to 53 of SEQ ID NO:2), and CDR3 aa residues QGVYSSVSDVYA (residues 90 to 101 of SEQ ID NO:2), or
- (2) amino acid sequences having at least about 70%, 75%, 80%, 85%, 90%, 95%, 98% sequence identity, or between about 70% to 100% sequence identity, to each of the three CDR1, CDR2 and CDR3 complementarity determining regions (CDRs) of SEQ ID NO:2, or CDR1 amino acid (aa) residues ESAYNNR (residues 27 to 33 of SEQ ID NO:2), CDR2 aa residues DAS (residues 51 to 53 of SEQ ID NO:2), and CDR3 aa residues QGVYSSVSDVYA (residues 90 to 101 of SEQ ID NO:2);
- or
- (3) an amino acid sequence having at least about 70%, 75%, 80%, 85%, 90%, 95%, 98% sequence identity, or between about 70% to 100% sequence identity, to SEQ ID NO:2, or an amino acid sequence having complete (100%) sequence identity to SEQ ID NO:2;
- or
- (c) a heterodimer capable of specifically bind to a human homeobox NKX-2.1 protein or polypeptide comprising the heavy chain variable region (VH) of (a) and the light chain variable region (VL) of (b).