On the timing of monozygotic twinning events.
D000650:Amnion / Q000502:physiology; D000818:Animals; D002823:Chorion / Q000502:physiology; D004622:Embryo, Mammalian / Q000502:physiology; D005260:Female; D006801:Humans; D051379:Mice; D008815:Mice, Inbred Strains; D011247:Pregnancy; D011272:Pregnancy, Multiple; D013997:Time Factors; D014427:Twins; D014430:Twins, Monozygotic