B cell migrating through bone channel (IMAGE) Washington University School of Medicine Caption A newly developed B cell (green in middle of image) migrates from the bone marrow of the skull, where a cluster of other new B cells remain, then through the skull bone, to the protective tissue that covers the brain, which is populated mainly by other cells (blue). Researchers at Washington University School of Medicine in St. Louis have discovered that the immune cells stationed in the protective tissue known as the meninges come primarily from the skull. The finding opens up the possibility of developing therapies to target such cells as a way to prevent or treat brain conditions. Credit Simone Brioschi Usage Restrictions This image is to be used in accordance with the mission, policies and guidelines of Washington University in St. Louis. Visit https://wustl.edu/about/compliance-policies/media-policies/multimedia-use/ for more information. 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.