Abstract
Thyroxine and triiodothyronine binding sites are present on the 20-nm spherical particles associated with hepatitis B surface antigen (HBsAg). Thyroxine-treated HBsAg has a buoyant density of 1.26 g/cm-3 in CsCl and appears under the electron microscope as a hexagonal particle with a center-to-vertex distance of 10 nm. These results provoke questions concerning the origin of thyroid hormone binding sites on HBsAg and a possible relationship between thyroid status and HBsAg antigenemia in humans.
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