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they used a new gene-editing technique called CRISPR/Cas9 on 86 embryos to try to modify a gene responsible for a blood disorder. Things did not go well
"this week will go down as a pivotal moment in the history of medicine." This particular experiment may have tanked, but it's not a "deal-breaker" for the technology, he writes. But, as with cloning, society may now have to make some decisions about what's appropriate.