Gut microbiota (IMAGE) Institut du Cerveau (Paris Brain Institute) Caption Commensal bacteria (red) amongst the mucus (green) and epithelial cells (blue) in a mouse small intestine. Credit University of Chicago. Usage Restrictions No restrictions. License Public Domain 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.