title: Letter: HBAg subtypes in familial carriers.
mesh_terms: D002353:Carrier State; D005260:Female; D006385:Hemagglutination Inhibition Tests; D006509:Hepatitis B / Q000235:genetics / Q000276:immunology*; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D007564:Japan; D008431:Maternal-Fetal Exchange; D011247:Pregnancy
chemical_list: D006511:Hepatitis B Antigens