Immune Cells -- Missing Link? (IMAGE) University of Virginia Health System Caption A composite image showing the immune cells. In addition to being important defenders of the brain, the cells may also may be the missing link connecting the brain's immune response to the microbiome in the gut. That relationship already has been shown important in Parkinson's disease. Credit Sachin Gadani | University of Virginia School of Medicine Usage Restrictions May be used by reporters and webmasters to accompany news coverage of the immune cell discovery. All other uses require express written permission from the University of Virginia Health System. 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.