• Article
    | Open Access

    Since the birth of the first cloned animal, Dolly the sheep, concerns have been raised about potential long-term health consequences of cloning. Here the authors report on a cohort of 13 aged cloned sheep, including four created from the same cells as Dolly, and find they are healthy and seem to age normally.

    • K. D. Sinclair
    • , S. A. Corr
    •  & D. S. Gardner