Purity >90% by SDS-PAGE, MW: 38.8 kDa. TFB1M Human Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 340 amino acids (28-346 a.a.) and having a molecular mass of 38.8kDa.TFB1M is fused to a 21 amino acid His-tag at N-terminus and purified by proprietary chromatographic techniques.