Rac 2 Study Characters (IMAGE) University of California - Santa Barbara Caption Many aspects of the immune system are involved in these findings. Credit Matt Perko, UC Santa Barbara Usage Restrictions Credit must be given to the creator. License CC BY 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.