sh-Oligopeptide-97 SP is a single chain human peptide produced synthetically to be identical to a portion of the protein, Prothymosin alpha, and contains 28 amino acids consisting of alanine, asparagine, aspartic acid, glutamic acid, isoleucine, leucine, lysine, serine, threonine and valine. The parent protein contains a maximum of 111 amino acids which may contain disulfide bonds and/or glycosylation, and consists of the proper sequence of the 20 standard amino acids.