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Changes in the percentage of viability of treated cells (AGS, PC3, and MCF7) with different concentrations (0, 5, 10, 20, 50, 75, 100, 200, 300, 400, and 600 μg/ml) of bromelain were measured by MTT (optical density technique). Cells were incubated for 24 h at 37°C. Data are mean ± standard error of at least three independent experiments
