FN1 and idiopathic pulmonary fibrosis: Idiopathic pulmonary fibrosis (IPF) is a disease characterised by alveolar epithelial cell injury and hyperplasia, inflammatory cell accumulation, and fibroblasts hyperplasia1 that results in the deposition of extracellular matrix, including fibrillar collagens, fibronectin, elastic fibres, and proteoglycans2.