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Some amphibians, like salamanders, use adult stem cells to regrow limbs

Two American studies recently published in Nature appear to dash hopes that it will soon be possible to use stem cells from adults rather than embryos for treating disease. This would have afforded scientists a huge advantage, sidestepping ethical concerns and providing an immediate source of wholly compatible tissue for every individual. Need a new heart? Just scrape off a few skin cells and change them into cardiac…

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