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Effects of different concentrations of flavonoids fraction (FF) on LPS induced NO production in RAW 264.7 cells. Cells were pretreated with FF (50, 100 and 200 μg/ml) for 1 h, followed by LPS (1 μg/ml) stimulation for 18 h. Values represent the mean ± SD of the three independent experiments (#compared with the control, *compared with LPS, */#p < 0.05, **/##p < 0.01).
