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How did Dolly the sheep contribute to the development of de-extinction technology?

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Replica of a woolly mammoth with long curved tusks and shaggy fur on display in a museum exhibit, set against a dramatic painted landscape backdrop. — de-extinction The woolly mammoth (*Mammuthus primigenius*)—represented here by a replica in a Canadian museum—is an example of an extinct species that someday could be resurrected through de-extinction.

Dolly the sheep, born in 1996, was the first mammal cloned from an adult cell, a breakthrough achieved through a technique known as somatic cell nuclear transfer (SCNT). This milestone proved that adult mammalian cells, which were previously thought to have lost their totipotency, could be reprogrammed to create a viable organism.12

In the context of de-extinction, Dolly’s creation provided the foundational "proof of principle" that SCNT could be used to generate clones from somatic cells. This technology is now a primary tool in de-extinction research, where scientists aim to transfer the nucleus from the preserved cells of an extinct species into the enucleated egg of a closely related living surrogate.13

While the 2009 attempt to resurrect the Pyrenean ibex utilized SCNT, the process remains technically challenging and inefficient. Despite these hurdles, the success of Dolly fundamentally shifted scientific understanding of developmental biology and genetics, establishing the reproductive cloning framework that continues to guide modern efforts to bring extinct species back to life.32