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Cell apoptosis rate was determined by flow cytometry following Annexin-V-fluorescein isothiocyanate/propidium iodide staining. Human bronchial epithelial cells were treated with MC-LR at various concentrations for 24 h and 48 h in the presence or absence of Z-VAD-FMK pretreatment for 30 min. Mean ± standard deviation *P<0.05 vs. control group (0 µM). MC-LR, microcystin-LR
