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Schematic diagram of hepadnavirus particles. Individual subunits containing SHBs protein only, HBs protein plus pre-S2 (MHBs), and HBs protein plus pre-S1 and pre-S2 (LHBs) are shown in intact virus, among filamensts and spheres. The virus particles contain an internal nucleocapsid (HBc) and viral genome. pol, polymerase. Reprinted from reference 77 with permission of the publisher.
