title: ABO status and T-cell help.
authors.forename: L A
authors.initials: LA
authors.lastname: Kay
mesh_terms: D000017:ABO Blood-Group System / Q000276:immunology*; D000937:Antigen-Antibody Reactions; D001402:B-Lymphocytes / Q000276:immunology; D006801:Humans; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000017:ABO Blood-Group System