Figure 2. Effects of crude drug extracts on nitric oxide (NO) production in LPS-stimulated RAW 264 cells. Cells were pretreated with the ethanol extracts of crude drugs for 0.5 h prior to incubation with LPS (100 ng/ml) for 24 h. The levels of NO in the culture medium were measured using Griess reaction. Data are presented as the mean±SD (n=4).
