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Effect of gemcitabine on human lung cancer cell lines. Human lung cancer cell lines, namely PC9, H1299 and H1650, were treated with 0.01–100 μM gemcitabine for up to 72 h. Untreated cells (0 μM gemcitabine) were used as the Control. All experiments were conducted in triplicates and repeated at least 3 times. Data are shown as the mean ± SD. Dotted line indicates 50% cell viability
