Colonic Cells to Study Mucus Secretion (IMAGE) Center for Genomic Regulation Caption Colonic cells are cultured in the lab and differentiated to accumulate mucus. In the image, nuclei are stained in red, in green at the left is the actin (the skeleton that holds the cells) and at the right the mucus granules. Credit Gerard Cantero -Recasens, CRG. Usage Restrictions CC BY-SA 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.