KRT5 and idiopathic pulmonary fibrosis: In bronchioles surrounded by collagen VII (Supplemental Figure S8, E–G, and M–O) in control lungs and some parts of epithelium in remodeled bronchioles in IPF lungs, both keratins seemed to label cells at the base of the pseudostratified epithelium, and KRT5 was additionally expressed in a few scattered columnar cells, similar to that in controls [Figure 5, A, B, D, and E (for IPF lungs), and Supplemental Figure S8, A–F, H–N, and P (for control lungs)].