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Twin baby monkeys born from cloned embryos clutch each other at the Oregon Regional Primate Research Center in Beaverton, Oregon March 4. The procedure used to produce the monkeys last year, nuclear embryo transfer, confirms that genetically identical twin monkeys can be reproduced.

Genetically cloned animals

Scientific success has added to the growing list of animals that have been cloned from adult cells, including Dolly the sheep, fish, pigs, goats, cattle, mice and even an ox-like creature called a gaur.