Studies on symmetrically conjoined twins.
D000328:Adult; D005260:Female; D005306:Fertilization; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D011247:Pregnancy; D012621:Seasons; D012723:Sex; D014428:Twins, Conjoined / Q000209:etiology*