A Single Layer of Epithelial Cells (IMAGE) International School of Advanced Studies (SISSA) Caption This image shows a single layer of epithelial cells stretched (left) and then released (right). On the right, cracks clearly visible along the cell junction lines. The cracks originated from the coupling of the epithelial tissue with the hydrogel substrate -- Credits: L. Casares and X. Trepat, IBEC, Barcellona (DOWNLOAD HD). Credit Institute for Bioengineering of Catalonia 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.