Purity >85% by SDS-PAGE, MW: 27.8 kDa. POP4 Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 243 amino acids (1-220 a.a.) and having a molecular mass of 27.8kDa.POP4 is fused to a 23 amino acid His-tag at N-terminus and purified by proprietary chromatographic techniques.