Sirt1 (IMAGE) Washington University School of Medicine Caption New research has identified the mechanism by which the sirtuin protein Sirt1, shown in green, operates in the brain to delay aging and increase longevity. Credit Imai laboratory Usage Restrictions Credit to Imai laboratory 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.