'Clone Sisters' Of Dolly The Sheep Are Alive And Kicking
Dolly, the first cloned mammal, had early arthritis and died young, raising concerns that clones age prematurely. But a study confirms the sheep's four sister clones are healthy and aging well.
Đọc thêm tại NPR
at July 26, 2016 at 10:04PM
Health & Science
Thứ Ba, 26 tháng 7, 2016
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