title: Rare gems: null phenotypes of blood groups.
authors.forename: Willy A
authors.initials: WA
authors.lastname: Flegel
mesh_terms: D001771:Blood Banks; D001789:Blood Group Antigens / Q000235:genetics* / Q000378:metabolism; D005060:Europe; D006801:Humans
chemical_list: D001789:Blood Group Antigens