Figure 3: MPO measured in the liver following 3 repeated doses of NMs over three days (3 doses of 100 μl of 64 μg/ml every 24 hr). The animals were dissected 72 hr following the initial dose. The negative control is representative of animals injected with three doses of 100 μl of PBS, while the positive control animals were injected with three doses of LPS (50 μl - 50 μg/ml per injection). (n=3±SEM) *P<0.05, **P<0.005compared to negative control.