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A 3800-year-old mummy is on show during the "Secrets of the Silk Road" exhibition, featuring archeological findings in Northwest 皇冠体育app's Xinjiang Uygur autonomous region at the museum of Pennsylvania University in Philadelphia, Feb 18, 2011. It is the third leg of the exhibition in the US, which will last until March 28, 2011. [Photo/Xinhua]