Intestinal Stem Cells (IMAGE) University of California - Berkeley Caption These are cells in the adult fly midgut. The intestinal cells are outlined in red and have large blue nuclei. The stem cells are tiny and colored green (their nuclei are not visible). Credit Lucy O'Brien and David Bilder, UC Berkeley 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.