Purity ~90% (SDS-PAGE). Reacts strongly with human HBV positive serum. Source: Recombinant protein corresponding to HBV surface, expressed in E. coli. Molecular Weight: ~31kD Endotoxin: ~1IU/ug Applications: Suitable for use in ELISA, Lateral flow. Other applications not tested. Recommended Dilution: Optimal dilutions to be determined by the researcher.