February 22nd 1997; scientists in Scotland announced the birth of the world's first successfully cloned mammal, Dolly the sheep. Dolly, who was created at the Roslin Institute in Edinburgh, was actually born on 5 July 1996 although her arrival has only just been revealed. Dolly was the first mammal to have been successfully cloned from an adult cell. Previous cloning has been from embryo cells. The sheep's birth has been heralded as one of the most significant scientific breakthroughs of the decade although it is likely to spark ethical controversy. Scientists in Scotland cloned a ewe by inserting DNA from a single sheep cell into an egg and implanted it in a surrogate mother. DNA tests have revealed that Dolly is identical to the ewe that donated the udder cell and is unrelated to the surrogate mother.