ABO status and T-cell help.
Kay
L A
LA
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*
D000017:ABO Blood-Group System