title: [Letter: The Duffy system. Gene frequencies and family study].
mesh_terms: D001789:Blood Group Antigens; D005260:Female; D005787:Gene Frequency; D006801:Humans; D008297:Male; D010334:Paternity
chemical_list: D001789:Blood Group Antigens
vernacular_title: Das System Duffy: Genfrequenzen und Familienuntersuchung.