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POPSDon't say stem cell therapy, say Regenerative medicine. "Where is this all heading? Regenerating the eyes of the elderly, the spinal cords of the paralysed and the insulin-producing cells of the diabetic is undoubtedly wonderful medicine. But you can't help wondering whether there is a point at which regeneration would stop. Will we be able one day - in centuries to come - be able to replace any ageing tissue? At the very least, regenerative medicine offers the prospect of a far longer life. Immortality - should we want it - may take a little longer."