IL17A and idiopathic pulmonary fibrosis: Similar to the IPF lungs, the IL‐17RA level of AECIIs from BLM‐induced PF lungs was significantly higher than that from saline controls, while AECIIs from IL‐17A−/− lungs showed decreased IL‐17RA expression compared with that from WT lungs (Figure 2B,C).