Cas9 (IMAGE) Arizona State University Caption The graphic illustrates the technique described in the new study. A version of the Cas9 protein used in CRISPR gene editing has been mutated. While this protein, seen in blue, retains its proper functioning, it remains "immunosilent"--hidden from predation as a foreign entity by the immune system's T cells (seen in brown). Credit Graphic by Jason Drees 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.