(IMAGE) Institut Pasteur Caption Airway basal cells from an animal model in culture marked red by cytokeratin 14 (a specific marker). The nuclei are stained blue with DAPI, a fluorescent molecule. Credit Integrative Neurobiology of Cholinergic Systems Unit at the Institut Pasteur Usage Restrictions Credit : Integrative Neurobiology of Cholinergic Systems Unit at the Institut Pasteur 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.