title: A case of Am, a rare variant in the ABO blood group system.
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics*; D000368:Aged; D000372:Agglutination Tests; D014644:Genetic Variation; D006801:Humans; D008297:Male; D010641:Phenotype
chemical_list: D000017:ABO Blood-Group System