hchA produced in E.Coli is a single, non-glycosylated polypeptide chain containing 303 amino acids (1-283 a.a.) and having a molecular mass of 33.3kDa. hchA is fused to a 20 amino acid His-tag at N-terminus & purified by proprietary chromatographic techniques. Purity >95.0% as determined by SDS-PAGE.