CLDN10 and idiopathic pulmonary fibrosis: Our current study demonstrates that in IPF lungs Cldn10-positive cuboidal or oval cells widely populate fibrotic and nonfibrotic regions in varied arrangements, i.e. as a single cell (Figure 3G & H), in monolayer (areas designated by asterisks in Figure 2D & G; Figure 3) and in massive forms (arrow in Figure 2D; area surrounded by dot-dashed line in Figure 2O).