sr-(Methionyl sh-Polypeptide-38 Dipeptide-19 Hexapeptide-40) is a single chain recombinant peptide produced by fermentation in E. coli. The starting gene is synthesized by the fusion of the genes from sh-Polypeptide-38, Dipeptide-19 and Hexapeptide-40 with the initiation code for methionine. The fusion peptide contains 147 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.