When Dolly the sheep was born 20 years ago, The University of Edinburgh's famous girl was the first mammal created by way of true cloning. Her embryo was created not using the sex or stem cells of another sheep, but from mature cells taken straight from the donor's mammary tissue.Then, at age five - middle age, for a sheep living the good life in a research facility — Dolly developed osteoarthritis. She died at the age of six, riddled with joint and lung problems [...]
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