Dolly, the cloned sheep
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Dolly the sheep made history in 1997, when the scientists who created her announced she was the first cloned mammal to survive. Scientists created Dolly in a test tube, after they figured out how to take a sheep egg cell, remove its DNA, and replace it with DNA extracted from a different sheep's skin cell. The newly fused cell was then implanted into a surrogate mother sheep, who gave birth to Dolly on July 5, 1996, she was named after the country singer Dolly Parton.