Patent ID: 7981691

Claim:
An isolated polypeptide selected from the group consisting of: VENKC 2 NKE 1 MRNRYWE 1 AALDPNLNNQQKRXKIRSIYDDPC 2 (SEQ ID NO. 32) or a four-residue N-terminal truncated variant of SEQ ID NO. 32, wherein E 1 is selected from an O-allyl glutamic acid or an O-allyl glutamic acid analog, and a covalent bridge is between two E 1 residues, wherein, X is alpha amino isobutyric acid or an alpha amino isobutyric acid analog other than a naturally occurring amino acid; C 2 is an extended cysteine, wherein a disulfide bond connects the C 2 residues; and wherein the polypeptide binds specifically to human epidermal growth factor receptor 2 (Her2).