The Experiment that Changes Biology Forever: After 20 Years Cloning Mice Confirm that They Die by Repeating the Process

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In 1997, the Dolly sheep made cloning a reality. Since then, the idea has come out every time we talk about biotechnology, animal husbandry or conserving endangered species. But there was a basic question. Can one “copy” a mammal over and over again, without going through sexual reproduction, and keep the chain forever? A group from the University of Yamanashi (Japan) has tested it for two decades and found a clear limit, with results published …