Purity >90% by SDS-PAGE, MW: 35.0 kDa. GET4 Human Recombinant produced in E. coli is. a single polypeptide chain containing 350 amino acids (1-327) and having a molecular mass of 38.9kDa. GET4 is fused to a 23 amino acid His-tag at N-terminus and purified by proprietary chromatographic techniques.