sr-(Oligopeptide-249 sh-Polypeptide-58) is a single chain fusion peptide, produced by fermentation in E. coli. The starting gene is synthesized by the fusion of the gene from Oligopeptide-249 and sh-Polypeptide-58. The fusion peptide contains 196 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.