SCGB3A2 and idiopathic pulmonary fibrosis: To further evaluate the co-expression of PDCD5 with other epithelial cell makers in IPF patients, co-IF staining was performed using Muc5AC (a goblet cell marker), Foxj1 (a ciliated cell marker) antibodies, and a Scgb3a2 antibody, which is another club cell marker.