Description: sr-rainbow trout oligopeptide-1 is a single chain recombinant protein produced by fermentation in e. coli. the starting gene is synthesized to be identical to the gene which codes for protamine-2 derived from the rainbow trout, oncorhynchus mykiss. protamine-2 contains 32 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 amino acids.