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A Structure of NC. B The cell viability of normal lung cells BEAS-2B and 11 lung cancer cells are measured by MTT assay for 48 h. C Colony formation assays were performed using H1688 and A549 cells with or without NC or DDP for 10–14 days. D The cell viability of H1688 and A549 cells treated with the indicated concentrations of NC for 24, 36 and 48 h respectively. *P < 0.05, **P < 0.01, ***P < 0.001 vs control
