Dark Microglia (IMAGE) Advanced Science Research Center, GC/CUNY Caption Electron micrographs show typical microglia in the prefrontal cortex of a 92-year-old healthy female (left) and dark microglia a 91-year-old female patient with Alzheimer’s disease (right). Credit Anna Flury Usage Restrictions All Rights Reserved License Original 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.