Genetically Edited Mice (IMAGE) University of Bath Caption The left-side group of mice is a control -- with neither the gene editing RNA, nor the BOC switch. The next group has BOC but no RNA, and the third has the RNA, but no BOC to switch it on. The final group on the right has the gene editing machinery and the BOC switch. BOC activates the switch and the pups are born without green fluorescence. Credit Tony Perry/University of Bath Usage Restrictions With 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.