FOXJ1 and idiopathic pulmonary fibrosis: Additionally, our analysis of gene expression in lung tissue demonstrated increased expression of airway epithelial cell-associated transcripts [5] including basal cell-specific keratins (K) (K5, K14), the airway secretory cell marker (PLUNC), and ciliated cell markers (FoxJ1 and various ciliary dynamins) in patients with IPF/UIP.