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Stem cell breakthrough?

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Harvard scientists turn skin cells into stem cells:
There is a limited supply of human eggs, which are needed for creating embryos through cloning, and egg donors face a slight health risk. The new cell fusion technique would enable scientists to create vastly greater quantities of embryonic stem cells for research.

That would mean they could do far more experiments aimed at understanding what happens when a regular, adult cell is transformed into an embryonic stem cell, a process known as ''reprogramming." Researchers are struggling to determine how a cell that is ''adult," already committed to its role in the body as, for example, a nerve cell or skin cell, regresses back to the proto-state in which, as a stem cell, it could still potentially become any of the hundreds of types of cells in the body.