Gut Bacteria (IMAGE) University of North Carolina Health Care Caption This is bacteria (in red) localized to the intestinal mucus layer. Credit Image provided by the Keku laboratory, UNC School of Medicine. Usage Restrictions None 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.