1986: Clones from specialized cells.

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Scientist Profile:
Steen Willadsen

In 1986, while working at Grenada Genetics, Steen Willadsen cloned a cow using differentiated, one week old embryo cells. The work proved that the genetic information of a cell did not diminish as a cell specialized and that DNA could return to its original state. Willadsen never officially published his results, but the work was a strong influence in Ian Wilmut's decision to attempt to clone from adult cells, which he accomplished in the famous 1996 birth of "Dolly."

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