Mouse Pancreatic Islet (IMAGE) Université de Genève Caption Mouse pancreatic islet in which the glucagon (purple)-producing alpha-cells have been labeled with a fluorescent tag (green). Some of them have started to produce insulin (red), and they appear as yellow (green-and-red merge). Credit © UNIGE 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.