http://www.abc.net.au/news/2016-07-27/healthy-clones-dolly-the-sheep’s-heirs-reach-ripe-old-age/7663564
Four genetically identical copies of Dolly the famous cloned sheep, which suffered ill health and died prematurely in 2003, are going strong at the advanced age of nine, a study says.
Debbie, Denise, Dianna and Daisy — identical sisters of Dolly, though born 11 years later — were “in pretty good health”, according to researchers who studied whether cloned animals can live long, healthy lives.
The quadruplets were made from the same mammary gland cell line that yielded Dolly — the first mammal cloned using a technique called somatic-cell nuclear transfer (SCNT).
Born 20 years ago on July 5, 1996, Dolly developed crippling knee arthritis aged five and died of lung disease at the age of six — about half the life expectancy of her breed of Finn-Dorset sheep.
—
The data, said the team, was “compelling, indicating no detrimental long-term adverse effects of SCNT on the health of aged adult offspring”.
—