title: Investigation of Ael and Ax subgroups.
mesh_terms: D000017:ABO Blood-Group System; D000328:Adult; D001787:Blood Group Incompatibility / Q000517:prevention & control*; D005260:Female; D006801:Humans; D007106:Immune Sera; D008297:Male; D065227:Transfusion Reaction
chemical_list: D000017:ABO Blood-Group System; D007106:Immune Sera