Non-identicality of monozygous twins.
D000818:Animals; D001135:Armadillos; D002417:Cattle; D002678:Chimera; D014644:Genetic Variation; D005826:Genetics, Medical; D005838:Genotype; D006648:Histocompatibility; D006801:Humans; D051379:Mice; D010641:Phenotype; D014427:Twins; D014430:Twins, Monozygotic