title: Monozygotic twinning and sirenomelia.
mesh_terms: D000015:Abnormalities, Multiple / Q000235:genetics*; D004200:Diseases in Twins; D004480:Ectromelia / Q000235:genetics*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007422:Intestines / Q000002:abnormalities*; D011247:Pregnancy; D014339:Truncus Arteriosus, Persistent / Q000235:genetics*; D014427:Twins; D014430:Twins, Monozygotic