sh-Polypeptide-98 Hexapeptide-40 is a single chain fusion peptide, produced by fermentation in HeLa cells. The starting gene is synthesized by the fusion of the gene from sh-Polypeptide-98 and Decapeptide-40. The fusion peptide contains 485 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.