Effect of CA extracts on NO production in LPS-stimulated RAW 264.7 cells. RAW 264.7 cells were treated with LPS, with or without different concentration of extracts. The culture supernatant was analyzed for nitrite production. NO production was measured after 20 hrs of sample treatment by the Griess reaction assay. Normal group was treated with media only. Control group was treated with the lipopolysaccharide (LPS, 1 μg/mL) alone. Data are expressed as mean ± S. D., where **p < 0.001,*p < 0.05 compared with control.