sr-(sh-Polypeptide-69 Dipeptide-19) 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-69 and Dipeptide-19. The fusion peptide contains 54 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.