SIRT1 (IMAGE) Washington University School of Medicine Caption A green stain lights up a protein tied to aging, showing that it is abundant in the hypothalamus region of mice brains. Credit Shin-ichiro Imai, Washington University in St. Louis 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.