sr-(Methionyl Staphylococcus Simulans Polypeptide-1 Dipeptide-53 Staphylococcus Phage 2638A Polypeptide-1) is a single chain recombinant peptide, produced by fermentation in E. coli. The starting gene is synthesized by the fusion of the gene from sr-Staphylococcus Simulans Polypeptide-1, Dipeptide-53 and sr-Staphylococcus Phage 2638A Polypeptide-1 with the initiation code for methionine.