Illustration binding of the PET-tracer (IMAGE) Karolinska Institutet Caption The binding of the PET-tracer BU99008 shows reactive astrogliosis in different parts of the brain of a deceased patient with Alzheimer's disease. The colours show the extent of the binding, where green is low, yellow is medium, and red is high binding. Credit Amit Kumar. 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.