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Toxicity of BIT and PE on SoluAirwayTM after the application of 3 µm or 5 μm aerosol: (a) Tissue viability of SoluAirwayTM tissue measured with MTT assay after the exposure to aerosols of BIT and PE with 5 µm MMAD (blue) or 3 µm MMAD (light blue) for 3 h. Values are mean ± SD (n > 2) or ½difference (n = 2). ** p < 0.01 by Student t-test (b) Representative histological photographs of the treated tissues after H&E staining. Scale bar is 20 µm.
