Prolactin Mouse Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 198 amino acids and having a molecular mass of 22.5 kDa. The Prolactin is purified by proprietary chromatographic techniques. Purity >95.0% as determined by: (a) Analysis by RP-HPLC. (b) Analysis by SDS-PAGE.