title: Xg groups and sex chromosome abnormalities in people of northern European ancestry: an addendum.
mesh_terms: D001789:Blood Group Antigens; D005060:Europe / Q000208:ethnology; D005260:Female; D006801:Humans; D008297:Male; D010641:Phenotype; D012729:Sex Chromosome Aberrations / Q000097:blood* / Q000235:genetics
chemical_list: D001789:Blood Group Antigens