Mitochondria 2 (IMAGE) Howard Hughes Medical Institute Caption While precisely editing the DNA in a cell's nucleus (blue) has become easier thanks to advances like CRISPR/Cas-9, it's been much harder to edit DNA in the mitochondria (red). Now, a new tool brings precision gene editing to mitochondrial DNA. Credit Tslil Ast/Mootha Lab Usage Restrictions Must use credit. 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.