PLA2G3 and pulmonary fibrosis: Interestingly, all these six dominant isoforms were found to be present only in structural cells like fibroblasts (PLA2G2A and PLA2G5), mesothelial cells (PLA2G2A) and epithelial cells (PLA2G1B, PLA2G3, PLA2G10 and PLA2G12A) that are key players in lung fibrosis.