sr-(Oligopeptide-304 Staphylococcus Simulans Polypeptide-1 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 Oligopeptide-304, sr-Staphylococcus Simulans Polypeptide-1, Dipeptide-19, and Hexapeptide-40. The fusion peptide contains 253 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.