Patent ID: 7348401

Claim:
A composition comprising a polypeptide consisting of a sequence X 1 -X 2 -X 3 -W-E-X 4 -X 5 -X 6 , wherein: E is a glutamic acid residue; W is a tryptophan residue; X 1 is a sequence of one to five amino acid residues; X 2 is an amino acid residue selected from the group consisting of asparagine, alanine, glutamic acid, glycine, histidine, isoleucine, leucine, methionine, phenylalanine, proline, tryptophan, tyrosine and valine; X 3 is arginine; X 4 is phenylalanine or tyrosine; X 5 is proline; and X 6 is a sequence of one to five amino acid residues wherein the polypeptide has a total number of amino acid residues ranging from 8 to about 15.