Separate teams of scientists on two continents revealed Tuesday that they have created stem cells from human skin cells - a development that eventually could allow researchers to sidestep the contentious moral issues that have hobbled early studies in a promising field.
The startling breakthrough was hailed by parties on all sides of the stem cell debate because it raised the prospect that the controversial destruction of human embryos and the need to harvest eggs from women donors might one day no longer be needed.
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