[Frequency of some blood group factors in twins and their parents].
D000017:ABO Blood-Group System; D000293:Adolescent; D001789:Blood Group Antigens; D002648:Child; D005260:Female; D006801:Humans; D008951:MNSs Blood-Group System; D008297:Male; D010127:P Blood-Group System; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System; D014427:Twins
D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D008951:MNSs Blood-Group System; D010127:P Blood-Group System; D012204:Rh-Hr Blood-Group System
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