Expression of PLA2G2A and PLA2G5 were found to be increased in fibroblasts of IPF patients whereas PLA2G3, PLA2G10 and PLA2G12A were increased in certain key epithelial cells like club cells, KRT5−/KRT17+ cells and ciliated cells (Figure 9). Here, KRT17 is linked to idiopathic pulmonary fibrosis.