Greater than 95.0% as determined by SDS-PAGE. NUDT9 produced in E.Coli is a single, non-glycosylated polypeptide chain containing 325 amino acids (47-350 a.a.) and having a molecular mass of 36.5kDa (molecular weight on SDS-PAGE will appear higher). NUDT9 is fused to a 21 amino acid His-tag at N-terminus; purified by proprietary chromatographic techniques. NUDT9 protein solution (1mg/ml) containing 20mM Tris-HCl buffer (pH 8.0), 10% glycerol, 1mM DTT and 0.1M NaCl.