The Parthenon-like structure (IMAGE) University of Tokyo Caption Most of the volume of epithelial cell bodies containing nuclei are aligned as a monolayer on the apical (upper) side. They extend pillarlike cell processes in a basal (downward) direction. At the basal (lower) side, the cytoplasm of epithelial cells spread planarly, creating a thin layer. Macrophage-like cells are found in the cavities between pillars. Credit Tetsuya Kojima, Graduate School of Frontier Sciences, The University of Tokyo Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Original 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.