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Human bronchial epithelial cells were pre-treated with various concentrations of Z-VAD-FMK (0, 10, 20, 40, 60, 80, 100, 120 and 140 µM) for 24 h, and cell viability was determined using an MTT assay. Mean ± standard deviation (n=5). *P<0.05 vs. control group (0 µM).
