Heart Cells (IMAGE) University of Washington Caption This is a layer of cells that coat the pulmonary artery grown on a bed of silicon microposts. After being exposed to a rapid flow, the cells make tighter junctions and tug more strongly on their neighbors. Credit N. Sniadecki, UW 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.