title: Letter: Rarity of S.H. antigen (HBsAg) in bile.
mesh_terms: D001646:Bile / Q000276:immunology*; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D008107:Liver Diseases / Q000276:immunology; D011863:Radioimmunoassay
chemical_list: D006511:Hepatitis B Antigens