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Content of lung hydroxyproline was determined by alkaline hydrolysis assay. Hydroxyproline content was significantly higher at 16 weeks than Sham group. Dexamethasone reduced lung hydroxyproline content which can reflect the content of collagen. *P < 0.001 versus RT group and Sham group at corresponding time points. Data are presented as the mean ± SD (n = 8/group/experiment).
