TGFB1 and pulmonary fibrosis: Alveolar macrophages are prompted to release substances such as CC chemokine ligand 2 (CCL2),28 oxidized phospholipids,29, 30 and citrullinated vimentin (Cit‐Vim),31 which enhance the expression of TGF‐β and CTGF, exacerbating pulmonary fibrosis.