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Summary of the lung fibrosisrelated intracellular signaling pathways induced by bleomycin, chronic intermittent hypoxia, and anti-fibrotic drug mechanisms. PF: pirfenidone; Keap1: Kelch-like ECH-associated protein 1; Nrf2: nuclear factor-erythroid-related factor 2; HO-1: heme oxygenase-1.
