Figure 4.

Cytotoxicity of ZnO NPs on human hepatocyte (L02) cells and human embryonic kidney (HEK293) cells (single asterisk,p< 0.05; double asterisk,p< 0.01).

Guan et al. Nanoscale Research Letters 2012 7:602   doi:10.1186/1556-276X-7-602
Download authors' original image