Mertens Illustration (IMAGE) Salk Institute Caption This is illustration represents a youthful neuronal mitochondrion with normal energy production (left side) juxtaposed with an aging mitochondrion with dysfunctional energy production (right side). Credit Veronika Mertens Usage Restrictions with credit and related coverage. 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.