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Excretion of nanoparticles after 13 weeks of consecutive oral administration. The concentrations of Ti in urine (A) and feces (C) were measured using an ICP-MS for TiO2 treatment groups. The concentrations of Zn in urine (B) and feces (D) were measured using an ICP-MS for ZnO treatment groups. Values are mean ± S.D. and n = 11. Significance versus vehicle control: *p < 0.05.
