title: A study of H-deficient A2 and A2 B phenotypes in Dar es salaam.
mesh_terms: D000017:ABO Blood-Group System / Q000276:immunology*; D044383:Black People; D006801:Humans; D007519:Isoantigens / Q000276:immunology*; D010641:Phenotype; D013636:Tanzania
chemical_list: D000017:ABO Blood-Group System; D007519:Isoantigens