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FILE - In this Oct. 9, 2018, file photo, a lab dish containing embryos that have been injected with Cas9 protein and PCSK9 sgRNA is seen in a laboratory in Shenzhen in southern China's Guangdong province.  A lab experiment aimed at fixing defective DNA in human embryos gives a frightening look at what can go wrong with this type of “gene editing” and why leading scientists say it’s too unsafe to try. Researchers reported Tuesday, Oct. 28, 2020, that in more than half of the cases, the editing caused unintended changes, such as loss of an entire chromosome or big chunks of it. (AP Photo/Mark Schiefelbein, File)

FILE - In this Oct. 9, 2018, file photo, a lab dish containing embryos that have been injected with Cas9 protein and PCSK9 sgRNA is seen in a laboratory in Shenzhen in southern China's Guangdong province. A lab experiment aimed at fixing defective DNA in human embryos gives a frightening look at what can go wrong with this type of “gene editing” and why leading scientists say it’s too unsafe to try. Researchers reported Tuesday, Oct. 28, 2020, that in more than half of the cases, the editing caused unintended changes, such as loss of an entire chromosome or big chunks of it. (AP Photo/Mark Schiefelbein, File)

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