eSpCas9 (IMAGE) Broad Institute of MIT and Harvard Caption Slaymaker and Gao et al. used structural knowledge of Cas9 to guide engineering of a highly specific genome editing tool. Credit Ian Slaymaker, Broad Institute Usage Restrictions None 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.