Cell Polarity (IMAGE) Cold Spring Harbor Laboratory Press Caption A confluent monolayer of polarized primary human bronchial epithelial cells. Phalloidin staining is shown in blue, and the polarity protein Par3 is shown in magenta. Credit Travis R. Ruch and Joanne N. Engel, University of California, San Francisco 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.