sr-(Methionyl s-Rainbow Trout Oligopeptide-1 sh-Polypeptide-116 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 s-Rainbow Trout Oligopeptide-1 (q.v.), sh-Polypeptide-116 (q.v.), and Hexapeptide-40 (q.v.), with the initiation code for methionine. The fusion peptide contains 312 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.