Mucus Layer Over Cells (IMAGE) eLife Caption Cells in the airway (indicated in red and blue) are protected by a layer of secreted mucus (in green). Credit Michael Vahey and Daniel Fletcher Usage Restrictions This image is free to be reused, as long as it is credited as appropriate. 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.