The longest-running trial of stem cells derived from a human embryo found that the cells caused patients none of the problems scientists feared, such as forming tumours, and reversed partial blindness in about half the eyes receiving transplants, researchers reported on Tuesday. The results, published in The Lancet , could help re-invigorate the controversial quest to harness stem cells, which have the ability to turn into any of the 200 kinds of human cells, to treat diseases.
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