CFTR Protein in Red (IMAGE) University of North Carolina Health Care Caption Normal primary human airway culture. Cilia in blue. The CFTR protein in red. Credit The Gentzsch Lab, UNC School of Medicine Usage Restrictions credit properly 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.