"Stupendous" and "mind-boggling" were just two reactions to the birth of Dolly, the first mammal cloned from an adult cell, 10 years ago this week. Suddenly, the idea of herds of identical prize bulls, or sheep producing medicines for humans in their milk, seemed wholly plausible. Then there was therapeutic cloning, which would provide genetically matched human tissue to patch up even the most seriously ill patient.
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