If stem cell researchers were oil prospectors, it could be said that they struck a gusher last week. But to realize the potential boundless riches they now must figure out how to build refineries, pipelines and gas stations. Biologists were electrified on Tuesday, when scientists in Japan and Wisconsin reported that they could turn human skin cells into cells that behave like embryonic stem cells, able to grow indefinitely and to potentially turn into any type of tissue in the body.
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