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Cytotoxicity of Bap to bronchial epithelial cells. Cells were incubated with different concentrations of Bap (16, 32, 64 and 128 µM). The cell viability was detected at 6, 12 and 24 h following incubation with Cell Counting Kit-8 reagent. **P<0.01 vs. control group. Bap, benzo[a]pyrene.
