Human gene-editing research, even on embryos, is needed and should go ahead, with one major caveat: No pregnancies can result, leaders of an international summit on the topic said December 3.
In recent years, scientists have devised increasingly precise molecular scissors for cutting and pasting DNA. These tools, especially the guided scissors known as CRISPR/Cas9, have become so cheap and easy to use that it may be possible to use them to correct genetic diseases.
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