Confocal Image (IMAGE) University of Queensland Caption These 'scavenger' cells (red) can mostly be seen on the outer surface of the brain, as well as wrapped around the outside of blood vessels (green) within the brain. Credit Bower et al., <i>Nature Neuroscience</i> Usage Restrictions This image can only be used if credited in full. It should not be kept on record and cannot be used to promote other papers or stories. 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.