Fig. 4

Nitric oxide production of LPS stimulated THP-1 macrophage cells. Nitric oxide production was determined after 6 h stimulation by 700 ng/mL control LPS and 700 ng/mL LPS of E. coli KUB-36. Data are plotted as average values of nitric oxide concentration ± standard error. Different lowercase letters (a–b) indicate significant differences (p < 0.05) between mean score of columns