THE row over whether clones are healthy or not has been stoked by the
discovery that some cloned animals really do die young.
When Dolly the sheep developed premature arthritis late last year, scientists
wondered whether all clones would grow old before their time. Now the first
controlled study of the lifespan of clones has come up with bad news. A batch of
cloned mice produced by Atsuo Ogura of the National Institute of Infectious
Diseases in Tokyo nearly all died earlier than their naturally bred cousins.
Cloners remove the nucleus from an egg and replace it with the nucleus…
