Dolly the sheep's cloned sisters in good health despite age

Though growing old, Dolly's sheep siblings are no worse for wear. Debbie, Denise, Dianna and Daisy, clones all derived from the same cell line as the first cloned mammal, show no signs of long-term health issues, according to research published Tuesday in the journal Nature Communications. The clones are, in fact, in vigorous good condition despite the fact that they range in age from 7 to 9, or about 60 to 70 in human years.

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