Fig. 10
Cerium levels in alveolar tissue. Rats were exposed to clean air or 3.0 mg/m3 CeO2 nanoparticles. Cerium levels were determined in tissue slices after one, 28 and 90 days exposure. Values are expressed as positive area per total tissue, normalized to the control group, mean + SD, *p < 0.05 vs. clean air control, n ≤ 5; Kruskal–Wallis–ANOVA with Mann–Whitney U-test as post hoc analysis