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Cells were treated with increasing concentrations of compounds for 48 hours; cell proliferation and viability was determined with WST-1 cell proliferation reagent. Results were expressed as cell viability (% of control). (A) Tannic acid, (B) Catechin, (C) Purpurin, (D) Reserpine. All data is expressed as mean ± SD (n = 6). *p<0.05, **p<0.01 and ***p<0.001 vs. 0 µg/ml.
