title: Origin of 48,XXXY: the evidence of the Xg blood groups.
mesh_terms: D000328:Adult; D000367:Age Factors; D000782:Aneuploidy; D001789:Blood Group Antigens; D002455:Cell Division; D002875:Chromosomes; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D008540:Meiosis; D008875:Middle Aged; D011247:Pregnancy; D012729:Sex Chromosome Aberrations / Q000209:etiology*
chemical_list: D001789:Blood Group Antigens