title: A study of African H-deficient A 2  and A 2 B phenotypes.
mesh_terms: D000017:ABO Blood-Group System; D044383:Black People; D004739:England; D006386:Hemagglutination Tests; D006801:Humans; D037102:Lectins; D010641:Phenotype; D014454:Uganda
chemical_list: D000017:ABO Blood-Group System; D037102:Lectins