Experimental Polyembryony in Mammals
Natural polyembryony is an extremely rare occurrence in mammals although the incidence of identical individuals is unknown in most species because generally they go unnoticed. The nine-banded armadillo (Dasypus novemcinctus) usually has monozygotic quadruplets and the eleven-banded armadillo (Dasypus hybridus) has between 7 and 12 (usually 8) identical young in each litter. Monozygotic twins also occur naturally in humans, sheep, and cattle, albeit rarely.
KeywordsNuclear Transfer Nuclear Transplantation Single Blastomere Sheep Embryo Normal Blastocyst
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