The Short, Unhappy Lives of Clones
Cloned animals may die young, according to the first study of their lifespans, carried out by Japanese researchers on mice.
Cloning involves removing the nucleus from an egg and replacing it with the nucleus of a donor cell. Many of the embryos created in this way never develop or miscarry, and even after birth some clones die. But up to now, cloning scientists have insisted that the few survivors can be perfectly normal.
But Atsuo Ogura of the National Institute of Infectious Diseases in Tokyo says his work suggests that some effects of cloning are not apparent in the days, weeks or even years after birth. ?It is very probable that, at least for some populations of clones, some unpredictable defects will appear in the long run,? he says.
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