Figure 5From: Comparative absorption, distribution, and excretion of titanium dioxide and zinc oxide nanoparticles after repeated oral administration Concentration of Zn in tissues after 13 weeks of consecutive oral administration of ZnO nanoparticles. The concentrations of Zn in the liver (A), spleen (B), kidney (C), and brain (D) were evaluated using an ICP-MS. Values are mean ± S.D. and n = 11. Significance versus vehicle control: * p < 0.05.Back to article page