Figure 2: MPO measured in the liver following 24, 48 and 72 hr exposure to 100 μl of 128 μg/ml the NM 300–Ag and NRCWE 002–positively charged TiO2. A positive control of LPS (50 μl-100 μg/ml) was also employed. The negative control is representative of animals injected with 100 μl of PBS. (n=3 ± SEM) *P<0.05, **P<0.005 compared to negative control.