title: Subtypes of hepatitis B antigen (HBAg) in Peru.
mesh_terms: D000939:Epitopes; D006511:Hepatitis B Antigens / Q000302:isolation & purification*; D006801:Humans; D007199:Indians, South American; D010568:Peru; D044469:Racial Groups
chemical_list: D000939:Epitopes; D006511:Hepatitis B Antigens