FOR ALL THE furious hype around the gene-editing tool Crispr/Cas9, no one has ever really seen it in action. Like really seen it. How the protein Cas9 unzips a strand of DNA, how it slips in the molecule that guides it to a target—and finally, how it goes snip snip on the DNA.
Gene editing has come further than ever before. That means we need to start thinking further ahead than ever before.
With this leukemia reversal, gene editing has now demonstrated remarkable promise and fueled optimism about future uses. But experts urge caution.
