r-(s-Rainbow Trout Oligopeptide-1 sh-Polypeptide-136) is a single chain fusion peptide produced by fermentation in E. coli. The starting gene is synthesized by the fusion of the gene from sr-Rainbow Trout Oligopeptide-1 and sh-Polypeptide-136. The fusion peptide contains 189 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.