sr-(Tripeptide-133 sh-Polypeptide-2 Hexapeptide-40) is a single chain recombinant peptide, produced by fermentation in E. coli. The starting gene is synthesized by the fusion of the gene from Tripeptide-133, sh-Polypeptide-2, and Hexapeptide-40. The fusion peptide contains 112 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.