title: HBsAg: a possible marker for discrimination in the classroom.
mesh_terms: D002353:Carrier State / Q000276:immunology*; D006509:Hepatitis B / Q000276:immunology*; D006514:Hepatitis B Surface Antigens / Q000276:immunology*; D006801:Humans
chemical_list: D006514:Hepatitis B Surface Antigens