George Seidel


It’s Been 20 Years Since We Cloned A Sheep. Why Haven’t We Done The Same With Humans?

Dolly was the single success from 277 tries at somatic cell nuclear transfer

Image by P. Vasiliadis via Wikimedia Commons (cc).

It’s been 20 years since scientists in Scotland told the world about Dolly the sheep, the first mammal successfully cloned from an adult body cell. What was special about Dolly is that her “parents” were actually a single cell originating from mammary tissue of an adult ewe. Dolly was an exact genetic copy of that sheep—a clone.

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