Figure 5From: Silver and Gold Nanoparticles Alter Cathepsin Activity In vitroBiocompatibility of Au-NPs in Vero cells. Cytotoxic levels were determined for 10- and 30-nm Au-NPs, following a 24-h exposure using a standard MTS cell viability assay. The cell viability in the treatment groups is expressed as percent control and plotted as the mean +/- SEM (n = 8).Back to article page