sr-(sh-Polypeptide-158 Tripeptide-46 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 sh-Polypeptide-158, Tripeptide-46, and Hexapeptide-40. The fusion peptide contains 100 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.