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Dr. Ron James, managing director of PPL Therapeutics, at the Roslin Institiute, Edinburgh, poses February 23, 1997 with sheep Dolly, the world's first adult animal cloned through nuclear transfer. The team at the institute claim the breakthrough will provide a massive boost to the battle to understand human and animal diseases like cystic fibrosis, emphysema, BSE and CJD. (KEYSTONE/EPA PHOTO/PA/Staff)