r-(Tetrapeptide-38 Hexapeptide-40 Nonapeptide-39 sh-Polypeptide-105) is a single chain fusion peptide, produced by fermentation in E. coli. The starting gene is synthesized by the fusion of the genes encoding for Tetrapeptide-38, Hexapeptide-40, Nonapeptide-39 and sh-Polypeptide-105. The fusion peptide contains 67amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.