Cited by Science magazine as the “breakthrough of 1997,” the world’s media flocked to cover the story of a cloned sheep named Dolly by scientists at Scotland’s Roslin Institute. While scientists had been cloning animals since 1952, when a tadpole was cloned, the creation of Dolly was significant because it was the first time a mammal had been successfully cloned. Since Dolly, researchers have cloned goats, cows, mice, pigs, cats, rabbits, and a gaur (an endangered species of wild ox). The application of cloning technologies to human beings raises a number of ethical concerns however.
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