Transforming growth factor‐β (TGF‐β) is a master profibrotic cytokine that is extremely important in the development of lung fibrosis and TGF‐β mediated EMT of alveolar epithelial cells (AECs) has been suggested to have prominent roles in the formation of myofibroblasts and progression of pulmonary fibrosis (Frangogiannis, 2020). The gene discussed is TGFB1; the disease is pulmonary fibrosis.