349140.fig.005a
(a)
349140.fig.005b
(b)
Figure 5: Cell viability after exposure to TiO2 particles. The relative cell viability after being exposed to 50, 100, and 150 μg/mL anatase (a) or rutile (b) TiO2 nanoparticles for 2 days was detected by MTT assay. compared to the control.