Walcher: Who decides what species come back from extinction?
By Greg Walcher | Commentary, GregWalcher.com
A British biologist named John Gurdon won a Nobel Prize for discovering that mature cells can be reprogrammed to become “pluripotent.” That means mature cells can be converted into stem cells, so brain cells can be changed into heart, foot, or skin cells. That enabled Gurdon in 1962 to clone the first vertebrate in his lab, an African clawed frog, now considered an invasive species in most of Europe, China, and the U.S.
This was interesting mainly to scientists until 1996 when a Scottish lab cloned the first mammal, a sheep named Dolly, an overnight global media sensation. It proved that the nucleus from an adult cell, transferred into an unfertilized egg, can divide and develop in the same mysterious way it does in a real womb.
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