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In this Feb. 23, 2017, file photo, Shi Zhengli works with other researchers in a lab at the Wuhan Institute of Virology in Wuhan in central China's Hubei province. (Chinatopix via AP, File)  ** FILE **

In this Feb. 23, 2017, file photo, Shi Zhengli works with other researchers in a lab at the Wuhan Institute of Virology in Wuhan in central China's Hubei province. (Chinatopix via AP, File) ** FILE **

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