Microglia (IMAGE) Duke University Caption In a mouse model of Alzheimer's disease, immune cells called microglia (shown in the black stain) become active in areas of the brain involved in memory and consume an important amino acid, arginine. Credit Carol Colton lab, Duke 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.