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An international team said July 22 it had cloned not one mouse, but dozens, from adult mice. Ryuzo Yanagimachi of the the University of Hawaii, said they had cloned several generations of mice and hoped their method would prove to be a breakthrough for both animal breeding and basic scientific research. Three generations of cloned mice are shown here. The second level combines both the second and third generations, demonstrating the magnitude of the process.

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.