Enhancing the Blood-Brain Barrier (IMAGE) University of Pennsylvania Caption Inflammation in a multiple sclerosis lesion prompts the blood-brain barrier to enhance the expression of netrin-1 (green) to limit immune-related damage. Blood-brain barrier vessels were labeled red and cell nuclei were stained blue. Credit University of Pennsylvania Usage Restrictions In context of reporting 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.