the major polypeptides ( p-1 , p-2 , and p-6 ) of hbsag were isolated from purified preparations of 22-nm hbsag particles , iodinated , and analyzed by double-antibody radioimmunoprecipitation assays for the presence of hepatitis b virus ( hbv ) -specific antigens .
C0019168
hbsag
C0019163
hepatitis b