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Characteristics of hepatitis B virus surface antigen (HBsAg) and hepatitis B virus (HBV). (a) Source and subtypes of HBsAg and HBV and available controls. (b) Representative Coomassie stained protein gel (CM) and Western blot (WB) of HBsAg purified from pooled patient sera and recombinant Chinese hamster ovary-derived HBsAg.
