Product Specifications Recombinant HCV NS3/NS4 Protein: Description: Protein is derived from HCV-1a, and made in yeast cells as a fusion with human superoxide dismutase (SOD). It covers Asp 1569 to Pro 1931 of the HCV polyprotein. It is equivalent to the C-100 antigen. Molecular Weight: 53 KDa. Purity: Over 95% pure. Storage: Store at -20°C. Stability: At least 1 year at -20°C. Biological Activity: Reacts in ELISA with serum from HCV positive individuals. Formulation: Solution at 0.50 mg/ml in 20mM Tris-HCl, 0.1% SDS 10mM DTT (pH 7.0.