MSC exosomes can promote the regeneration of alveolar epithelial cells, exert anti‐alveolar inflammation, prevent endothelial cell apoptosis, inhibit early epithelial‐mesenchymal trans‐differentiation and prevent myofibroblast growth by reducing the levels of TGF‐β, TNF‐α, type I collagen, type III collagen, hydroxyproline and serum ceruloplasmin in lung tissues, thereby alleviating pulmonary fibrosis.83 The gene discussed is TGFB1; the disease is pulmonary fibrosis.