Histology image (IMAGE) Umea University Caption The image shows the mucus layer (blue band) that protects the intestinal wall (pink) against bacteria and other things (dark blue at the top of the picture). The blue cells in the intestinal wall are mucus-producing goblet cells. Credit Rachel Feeney Usage Restrictions Free to publish. License Original 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.