Amyloid Plaque Positive for SFRP1 (IMAGE) Spanish National Research Council (CSIC) Caption This is an example of a human amyloid plaque positive for SFRP1 (red) and surrounded by microglial cells (green). Credit Pilar Esteve Usage Restrictions CC BY-NC 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.