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Photomicrographs of lung parenchyma after immunohistochemistry with (A) TGF-β and (B) the TUNEL method. Note the apoptotic cells (arrows) in the silicotic nodules. Bars: 100 µm. Quantification of TGF-β in (C) septae and (D) nodules. (E) Quantification of apoptotic cells in nodules. Data are presented as the mean ± SEM. n = 7 animals per group. #Significantly different from SIL40d. ##Significantly different from SIL70d.
