Human Lung Cell (IMAGE) University of California - Riverside Caption This is an image of a human airway epithelial cell, which acts as a protective barrier against inhaled environmental agents. Selenium-containing aerosol is shown to damage these cells. Credit C M Sabbir Ahmed/UCR 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.