Against apartheid in South Africa and an embryonic nuclear programme in Libya, they seem to have encouraged change.

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Instead of generating embryonic stem cell lines via nuclear transfer, Hwang's group produced the stem cells from days-old embryos, a technique that had already been established by James Thomson at University of Wisconsin in 1998.

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The gold standard embryonic stem cells still came from embryos themselves, including ones that were made through nuclear transfer.

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Instead, they want to use somatic cell nuclear transfer, the same process used to clone Dolly the sheep in 1997, to create embryonic stem cells.

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