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That promise became immortalised in a Korean postage stamp showing a man rising from his wheelchair. But it was always highly questionable. Even if Hwang had managed to derive cloned embryonic stem cells (ESCs) from the skin cells of Kim and 10 others - as he claimed in May 2005 - he would still have been a long way from mending Kim's spinal cord. Cloning merely provides ESCs that will not be rejected by a patient's immune system. Whether cells derived from them could ever fix a spinal injury, especially an old...