title: An occurrence of monozygotic twinning and anencephaly in Macaca arctoides.
mesh_terms: D000757:Anencephaly / Q000453:epidemiology / Q000662:veterinary*; D000818:Animals; D005260:Female; D008992:Monkey Diseases / Q000453:epidemiology*; D011247:Pregnancy; D014427:Twins; D014481:United States