“…Viability of cells for the extracts (1, 2.5, 5, 10, 25, 50, 100, and 200 lg/mL), compounds 1 -8 (1, 2.5, 5, 10, 25, 50, 100, and 200 lM), and L-NMMA (50, 100, 200, 400, and 800 lM) as a positive control was determined by an Ez-Cytox cell viability detection kit purchased from Dail Lab Service Co. (Seoul, Korea), as reported previously. [20] [21] Measurement of Nitric Oxide Production RAW264.7 cells were plated into a 96-well plate at a density of 3 9 10 4 cells/well and preincubated at 37°C for 24 h. After serum starvation for 12 h, cells were pretreated with the extracts (1, 2.5, 5, 10, 25, 50, 100, and 200 lg/mL), compounds 1 -8 (1, 2.5, 5, 10, 25, 50, 100, and 200 lM), and L-NMMA (50, 100, 200, 400, and 800 lM) as a positive control for 1 h, and then stimulated with 100 ng/mL of LPS for another 24 h. To evaluate NO levels in the culture media, nitrite, a soluble oxidation product of NO, was measured using the Griess reaction. [30] [31]…”