Fig. 1

Transmission electron microscope images of mice liver. a and b, parenchymal hepatocyte and phagocyte, respectively, from the liver of control mice, and c and d, parenchymal hepatocyte and phagocyte, respectively, from mice administered with 50 mg/kg TiO2-P25. * Photo B was from a control mouse in the short period experiment with TiO2-P25 (Ref. no.17)