Stem cell transplants offer hope to the thousands of people worldwide every year who suffer (chemical) burns on their corneas from heavy-duty cleansers or other substances at work or at home. The approach would not help people with damage to the optic nerve or macular degeneration, which (involves) the retina. Nor would it work in people who are completely blind in both eyes, because doctors need at least some healthy (tissue) that they can transplant. In the study, published online by the New England Journal of Medicine, researchers took a small number of stem cells from a patient's (healthy) eye, multiplied them in the lab and placed them into the burned eye, where they were able to grow new corneal tissue to (replace) what had been damaged. Since the stem cells are from their own bodies, the patients do not need to take anti-rejection drugs.
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