title: Letter: HBAg subtypes in glomerulonephritis.
mesh_terms: D005455:Fluorescent Antibody Technique; D005921:Glomerulonephritis / Q000276:immunology*; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D011863:Radioimmunoassay; D012703:Serotyping
chemical_list: D006511:Hepatitis B Antigens