News that U.S. scientists led by Oregon Health and Sciences University biologist Shoukrat Mitalipov have used the gene-editing technique known as CRISPR to modify the DNA of human embryos has led to renewed debate over human genetic engineering. Although scientists in China and the United Kingdom have already used gene editing on human embryos, the announcement that the research is now being done in the United States makes a U.S. policy response all the more urgent.
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