A Niche for Gut Bacteria (IMAGE) California Institute of Technology Caption An electron microscopy image of a section of the mouse gut, showing B. fragilis aggregating close to the epithelial cells that make up the lining of the gut. Credit Courtesy of the Mazmanian laboratory Usage Restrictions with image credit 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.