Binding Proteins To The Constant Region Of Immunoglobulin G

A polypeptide comprising an amino acid sequence of general formula 1 Z1-Z2-Z3 (SEQ ID NO:

• 1), wherein
• Z1 is a peptide with an amino acid sequence according to general formula 2:
• X1-S-X2 (SEQ ID NO:
• 2), wherein
• X1 is any four amino acids;
• and
• X2 is any nine amino acids;
• Z2 is a peptide of between 17 and 50 amino acid residues;
• and
• Z3 is a peptide with an amino acid amino acid sequence according to general formula 3:
• B1-Q-B2-F-Y-B3 (SEQ ID NO:
• 3)
• B1 is any four amino acids;
• B2 is any two amino acids;
• and
• B3 is any four amino acids.