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CSC reduced cell viability of BEAS-2B cells. BEAS-2B cells were exposed with 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14 and 0.16 mg/ml CSC for 24 h. Cell viability was measured by using CCK-8 assay. The values were presented as means ± SD of three independent experiments. *P < 0.05, **P < 0.01, ***P < 0.001 and ****P < 0.0001 indicated significant differences from the control (DMSO) group
