Fig. 6From: Titanium dioxide nanoparticles induce the expression of early and late receptors for adhesion molecules on monocytesEvaluation of the ROS levels in U937 cells exposed to TiO2 NPs in the presence or absence of NAC. The presence of NAC in cultures of U937 cells exposed to TiO2 NPs abolished the levels of ROS, and only a partial reduction was observed if the cells were exposed to 30 or 100 μg/mL of TiO2 NPsBack to article page