Amyloid Vessel (IMAGE) University of Rochester Medical Center Caption A ring of amyloid is visible in the wall of an arteriole in the brain of a patient who had Alzheimer's disease. The tissue has been stained with Thioflavin S so that the amyloid fluoresces in yellow. Credit James M. Powers, M.D., University of Rochester Medical Center. 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.