CRISPR system (IMAGE) Johns Hopkins Medicine Caption Left - a schematic of the long form of the tracrRNA used by the CRISPR-Cas9 system in bacteria; Right - the standard guide RNA used by many scientists as part of the gene-cutting CRISPR-Cas9 system. Credit Joshua Modell, Rachael Workman and Johns Hopkins Medicine 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.