Antibody Labeling (IMAGE) Allen Institute Caption Antibody labeling of a brain tissue sample from the Aging, Dementia and TBI Study. The dark brown spots are what is known as amyloid plaques, which are implicated in Alzheimer's disease. Credit Allen Institute Usage Restrictions Original format with proper attribution and caption. 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.