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By Daniel Dickson and Ben Hirschler STOCKHOLM/LONDON (Reuters) - Three scientists from Sweden, the United States and Turkey won the 2015 Nobel Prize for Chemistry on Wednesday for working out how cells repair damaged DNA, providing new ammunition in the war on cancer. Detailed understanding of DNA damage has helped drive a revolution in cancer treatment as researchers develop new drugs that target specific molecular pathways used by tumor cells to proliferate. Tomas Lindahl, Paul Modrich and Aziz Sancar won the prize for "mechanistic studies of DNA repair." Their work mapped how cells repair deoxyribonucleic acid (DNA) to prevent damaging errors from appearing in genetic information.