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DNA Synthesis inhibitory effects of compounds 2, 3, 5, 9, 10 and cisplatin on A549 (A) and C6 (B) cells. Mean percent absorbance of untreated control cells were assumed 0%. Three different concentrations (a: IC50/2, b: IC50, c: 3/2 IC50) of test compounds and cisplatin were given. Data points represent means for two independent experiments ± SD of four independent wells. p < 0.05.
