Natural Anti-CRISPRS (IMAGE) Cell Press Caption This visual abstract depicts the finding that naturally occurring inhibitors of CRISPR-Cas9 can block genome editing in cultured human cells, providing a means to spatially, temporally, and conditionally control Cas9 activity. Credit Pawluk et al./Cell 2016 Usage Restrictions Credit Required. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.