Patent ID: 7504380

Claim:
A peptide separated from tunicate and comprising amino acid sequence represented by chemical formula I: W 1 X 2 B′ 3 U 4 X 5 X 6 B 7 B 8 U 9 X 10 B′ 11 C 12 U 13 B 14 U 15 X 16 X 17 U 18 (SEQ ID NO: 11) (I) wherein, W represents tryptophan; X, each variable of which X 2 , X 5 , X 6 , X 10 , X 16 and X 17 is individually selected from an amino acid residue selected from the group consisting of tyrosine, valine, isoleucine, leucine, methionine, phenylalanine and tryptophan; B represents an amino acid residue selected from the group consisting of arginine, lysine and histidine; B′ represents an amino acid residue selected from the group consisting of arginine, lysine and histidine or from a group consisting of asparagine and glutamine; C is Cysteine; U represents an amino acid residue selected from the group consisting of glycine, serine, alanine and threonine.