TGFB1 and idiopathic pulmonary fibrosis: IPF lungs are enriched in glycosaminoglycans (GAGs) and TGF-β and deficient for laminin’s α-3 (LAMA3), β-3 (LAMB3), and α-2 (LAMC2) chains, all of which are components of the alveolar epithelial basal lamina.