Patent ID: 7408030

Claim:
An immunoglobulin binding peptide that binds to the Fc region of an antibody selected from the group consisting of: (a) the peptide HWRGWV (SEQ ID NO: 4), (b) the peptide HYFKFD (SEQ ID NO: 11). (c) the peptide HFRRHL (SEQ ID NO: 21), (d) the peptide HVHYYW (SEQ ID NO: 12), (e) peptides of (a), (b), (c), or (d) having a linking group bonded to the C terminus thereof; and (f) peptides of (a), (b), (c), (d), or (e) having a capping group bonded to the N terminus thereof; and wherein the amino acids of said peptide are in L form.