title: Weak reacting A antigen in an AB Brazilian Negroid donor.
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics*; D000328:Adult; D000917:Antibody Formation; D044383:Black People; D001782:Blood Donors; D001938:Brazil; D002648:Child; D005260:Female; D006801:Humans; D007106:Immune Sera; D008297:Male
chemical_list: D000017:ABO Blood-Group System; D007106:Immune Sera