Recombinant ACKA produced in E.coli is a single, non-glycosylated polypeptide chain containing 423 amino acids (1-400) and having a molecular mass of 45.7 kDa. The ACKA is fused to a 23 amino acid His-Tag at N-terminus and purified by proprietary chromatographic techniques. Purity >95.0% as determined by SDS-PAGE.