Greater than 95.0% as determined by SDS-PAGE. SURA E.Coli Recombinant produced in E.Coli is a single, non-glycosylated polypeptide chain containing 429 amino acids (21-428 a.a.) and having a molecular weight of 47.3kDa. The SURA is fused to 20 a.a His-Tag at N-terminus and purified by proprietary chromatographic techniques. The SURA 1mg/ml protein solution contains 20mM Tris-HCl, pH-8, and 10% glycerol.