IL17RA and pemphigus foliaceus: To verify the changes of IL‐17RA expression in AECIIs from BLM‐induced PF mouse models, we also detected the IL‐17RA level of AECIIs by immunofluorescence colocalization analyses in lung sections of BLM or saline‐administered IL‐17A−/− and WT mice using pro‐SPC as AECIIs marker.