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FILE - In this Oct. 9, 2018 file photo, an embryo receives a small dose of Cas9 protein and PCSK9 sgRNA in a microscope in a laboratory in Shenzhen in southern China's Guangdong province, during work by scientist He Jiankui's team. A report released on Monday, June 3, 2019, shows that people with a DNA mutation that reduces their chance of HIV infection have heightened overall death rate, warning that genetic tinkering can produce risks. Rasmus Nielsen of the University of California, Berkeley, senior author of the paper, acknowledged that his result cannot be applied directly to the two girls in China. (AP Photo/Mark Schiefelbein)

FILE - In this Oct. 9, 2018 file photo, an embryo receives a small dose of Cas9 protein and PCSK9 sgRNA in a microscope in a laboratory in Shenzhen in southern China's Guangdong province, during work by scientist He Jiankui's team. A report released on Monday, June 3, 2019, shows that people with a DNA mutation that reduces their chance of HIV infection have heightened overall death rate, warning that genetic tinkering can produce risks. Rasmus Nielsen of the University of California, Berkeley, senior author of the paper, acknowledged that his result cannot be applied directly to the two girls in China. (AP Photo/Mark Schiefelbein)

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