Developmental aspects of twins, twinning, and chimerism.
D002678:Chimera; D000013:Congenital Abnormalities / Q000473:pathology*; D004200:Diseases in Twins; D005260:Female; D005330:Fetofetal Transfusion / Q000473:pathology; D005333:Fetus / Q000473:pathology; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008297:Male; D010920:Placenta / Q000473:pathology; D010929:Placentation; D011247:Pregnancy; D014427:Twins; D014428:Twins, Conjoined / Q000473:pathology