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PTL attenuates the BLM-induced expression of NF-κB and Snail. a Immunohistochemical staining for NF-κB and Snail in lung sections. b Expression levels of NF-κB and Snail were evaluated by index of immunohistochemical staining. The number of positively stained cells was calculated from twenty different 400× magnified fields under a microscope. The data represent the mean ± standard deviation (SD), n = 10 per group. *, P < 0.05, **P < 0.01 vs. model group
