CRISPR-Cas9 is a reprogrammable DNA cutting machine that is being used to edit genomes in many organisms for research purposes. Its primary component, the Cas9 enzyme (orange), cuts genomic DNA ...

The anti-CRISPR protein (red on right) mimics DNA, binding in the site where the cutting enzyme Cas9 typically grips the target DNA (left) before it cuts. But the anti-CRISPR protein doesn't let ...