Cascade (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The architecture of the Cascade protein complex, a key player in the microbial immune system, resembles a seahorse, with crRNAs (green) displayed along the backbone within a helical arrangement of Cas protein subunits. Credit courtesy of Jennifer Doudna/Eva Nogales research groups 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.