THE DECISION to end Dolly’s life at age 6 — about half the life expectancy of her breed — was made because a veterinarian confirmed she had a progressive lung disease, according to the Roslin Institute, the Scottish lab where she was created and lived. “We must await the results of the post-mortem on Dolly in order to assess whether her relatively premature death was in any way connected with the fact that she was a clone,” said Richard Gardner, a professor of zoology at Oxford University and chair of the Royal Society working group on stem cell research and therapeutic cloning. “If there is a link, it will provide further evidence of the dangers inherent in reproductive cloning and the irresponsibility of anybody who is trying to extend such work to humans.” Ian Wilmut, the leader of the team that created Dolly, said it was unlikely her illness was attributable to being a clone. “The most likely thing is an infection which causes a slow progressive illness and for which there isn’t an effective treatment,” he said. “Sadly, we have had that in some of the sheep on the farm, so that’s the most likely explanation, but we don’t know.” Wilmut declined to name the disease but said it was a common respiratory infection that had been diagnosed in another of the sheep Dolly was housed with. “The most likely thing is she caught it from that sheep and it’s an unfortunate result of having to be housed in order to give her security and so that we could observe her,” Wilmut said. “Clearly, the whole group are very upset and sad.”


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