Twin zygosity diagnosis by blood group antigens.
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D005260:Female; D006801:Humans; D007519:Isoantigens; D008297:Male; D010641:Phenotype; D011247:Pregnancy; D011336:Probability; D014427:Twins
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D007519:Isoantigens