DNA Base Editor (IMAGE) Howard Hughes Medical Institute Caption A newly created DNA base editor contains an atom-rearranging enzyme (red) that can change adenine into inosine (read and copied as guanine), guide RNA (green) which directs the molecule to the right spot, and Cas9 nickase (blue), which snips the opposing strand of DNA and tricks the cell into swapping the complementary base. Credit Gaudelli et al./ <i>Nature</i> 2017 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.