CRNN Human Recombinant fused to 20 amino acid His Tag at N-terminal produced in E.Coli is a single, non-glycosylated, polypeptide chain containing 515 amino acids (1-495 a.a.)and having a molecular mass of 55.7 kDa. The CRNN is purified by proprietary chromatographic techniques.. Purity >85% as determined by SDS-PAGE.