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Treatment with curcumin causes a dose-depended decrease in cellular metabolic activity. A549 cells in 96-well plates were incubated with medium containing curcumin from 0–100 μM. Cellular metabolic activity was determined 8 (A) or 24 (B) h later. The mean of three experiments are shown and the error bars represent standard deviation (SD) of the mean. * p ≤ 0.05, ** p ≤ 0.01, **** p ≤ 0.0001, ns p > 0.05.
