There’s been good news and bad news about cloning of late. On the worrisome side, one of the creators of Dolly, the world’s first cloned mammal, report that the nearly 6-year-old sheep has developed arthritis in her left hip and knees. That’s early for a sheep to show such a malady, and the report renews concern that cloning may accelerate aging (SN: 4/29/00, p.
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