Geoffrey Norris, Ph.D., University of Virginia Health System (image) University of Virginia Health System Share Print E-Mail Caption Geoffrey Norris, Ph.D., and colleagues at the University of Virginia School of Medicine have shown that microglia are precision cleaning machines that respond to injury with surgical precision. Credit Josh Barney | University of Virginia Health System Usage Restrictions May be used to accompany news coverage of the microglia discovery. All other uses require express written permission from the University of Virginia Health System. Share Print E-Mail 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.