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Recruitment and cytokine release by monocyte-derived alveolar macrophages and M2 alveolar macrophages in idiopathic pulmonary fibrosis (IPF). EMT, epithelial-to-mesenchymal transition; TGF-β, transforming growth factor-β. MMPs, matrix metalloproteinases. CCL18, C-C motif chemokine ligand 18.
