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FILE - In this Dec. 1, 2015 file photo, Feng Zhang of the Broad Institute of MIT participates in a panel discussion at the National Academy of Sciences international summit on the safety and ethics of human gene editing, in Washington. Scientists are altering a powerful gene-editing technology in hopes of one day fighting diseases without making permanent changes to people's DNA.  (AP Photo/Susan Walsh)

FILE - In this Dec. 1, 2015 file photo, Feng Zhang of the Broad Institute of MIT participates in a panel discussion at the National Academy of Sciences international summit on the safety and ethics of human gene editing, in Washington. Scientists are altering a powerful gene-editing technology in hopes of one day fighting diseases without making permanent changes to people's DNA. (AP Photo/Susan Walsh)

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