Figure 3

Live/dead staining of human liver microtissue at 240 hr post repeated exposure. A) Control B) four treatments of ZnO (NM 110) NM at 8 μg/ml C) four treatments of Ag (NM 300) NM at 8 μg/ml D) four treatments of MWCNT (NM 400) NM at 125 μg/ml E) four treatments of TiO₂ (NRCWE 002) NM at 125 μg/ml F) 0.5% Triton-× 100 (24 hr – positive control). As a note the microtissue treated with the MWCNT was partially covered with the NMs hence the quality of the image is inferior to the rest.