“…In contrast, hyperimmune serum prepared against purified HB* Ag produced immunofluorescent staining exclusively in the cytoplasm of these cells. Thus, it appeared that HB, Ag (or antigens associated with it) was synthesized in the nucleus of the infected liver cell, and HBsAg was produced in the cytoplasm of these cells, a finding in good agreement with indirect immunofluorescence studies of Brzosko et al [4], One interpretation of the findings is that the spherical and filamentous forms of HBsAg may, in fact, consist of Dane particle coat components, synthesized in marked excess by the infected cell.…”