title: Genetic studies of an acardiac monster: evidence of polar body twinning in man.
abstract: Two maternally derived chromosome sets and both maternal histocompatibility antigen haplotypes were identified in the tissues of a malformed triploid acardiac twin that developed within the same chorion as its normal twin. These findings indicate that the twins arose as a result of independent fertilizations, by two different spermatozoa, of a normal haploid ovum and its diploid first-meiotic-division polar body.
mesh_terms: D009008:Abnormalities, Severe Teratoid / Q000235:genetics*; D005260:Female; D005306:Fertilization; D006680:HLA Antigens / Q000235:genetics; D006330:Heart Defects, Congenital / Q000235:genetics*; D006801:Humans; D007231:Infant, Newborn; D007621:Karyotyping; D008297:Male; D008540:Meiosis; D011123:Polyploidy; D011247:Pregnancy; D014427:Twins
chemical_list: D006680:HLA Antigens