Sirt4 (IMAGE) Brown University Caption This is Sirt4 (in green) in mitochondria (in red) of cells, with asuperimposed image on right (overlap in yellow). Credit Jason Wood, Brown University 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.