Mouse Lung (IMAGE) Yale University Caption Collagen fibers (in green) outline the bronchiole pathways against a background of elastin tissue (in red) in this high-resolution image of a mouse lung. Credit Michael Levene/Yale University Usage Restrictions With credit 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.