16-Year Old Frozen Mice Cloned

Scientists successfully cloned mice that had been frozen for 16 years. Fascinating stuff.

Cells taken from mice frozen 16 years ago have grown into healthy clones, raising the possibility of reproducing long-dead animals and even resurrecting extinct species.

The feat, accomplished in the laboratory of Japanese geneticist Teruhiko Wakayama, represents a large step forward in animal cloning. Earlier clones have required tissues taken from living animals or carefully preserved cells, rather than an entire frozen animal.

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