PDGFRA and idiopathic pulmonary fibrosis: The localization pattern was unchanged between donor and IPF vasculature; in both groups αSMA+ cells were confined to vascular regions up to the external elastic lamina (Supplemental Fig. S2, dotted line; https://doi.org/10.5281/zenodo.3532795), while PDGFRα+ cells were present almost exclusively in perivascular regions (Fig. 1A, zoomed area, Supplemental Fig. S2, continuous line; https://doi.org/10.5281/zenodo.3532795).