SRR Human Recombinant produced in E.coli is a single, non-glycosylated polypeptide chain containing 364 amino acids (1-340) and having a molecular mass of 39.1kDa. SRR is fused to a 24 amino acid His-tag at N-terminus & purified by proprietary chromatographic techniques. Purity >85.0% as determined by SDS-PAGE.