sr-(Methionyl sh-Polypeptide-3 Dipeptide-46 Oligopeptide-163 sh-Oligopeptide-197) is a single chain recombinant peptide produced by Chinese hamster ovary cells. The starting gene is synthesized by the fusion of the genes from sh-Polypeptide-3, Dipeptide-46, Oligopeptide-163, and sh-Oligopeptide-197 (q.v.) with the initiation code for methionine. The fusion peptide contains 75 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence from the 20 standard amino acids.