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Effect of POA on caspase 3 activity. HK-2 cells were treated with 0, 20, 40 or 80 µM POA for 24 h and caspase 3 activity was measured by ELISA. Data are presented relative to untreated control cells and as the mean ± standard deviation of 3 independent experiments. ***P<0.001 vs. control. POA, oxalicumone A.
