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Scientists in the United States have genetically engineered mice which can run twice as far as normal before becoming exhausted. The researchers say their finding could lead to drugs or gene treatments to improve the stamina of human athletes. Scientists add an additional active copy of a normal mouse gene. Humans have the same gene, called PPAR-delta, and two major pharmaceutical companies are already developing drugs which boost its activity. Somewhat inevitably in Olympic season, it been dubbed "the marathon mouse".
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