Cytotoxicity of Protein-Carbon Nanotubes on J774 Macrophages Is a Functionalization Grade-Dependent Effect

Figure 4

Apoptosis determination of MOs exposed to different CNTs at 24 h. Each bar represents mean ± SD of one experiment done in triplicate (). a, denotes significant differences between mean values measured in the indicated group compared to the control without stimulus (CTL); b, denotes significant differences between mean values for CNTs at different concentrations; c, denotes significant differences between mean values for a particular concentration among different CNTs.