Figure 4From: The cytotoxicity of polycationic iron oxide nanoparticles: Common endpoint assays and alternative approaches for improved understanding of cellular response mechanismTrypan blue exclusion assay using A) Fe3O4-PEI and B) Fe3o4-PEI-PEG on 1) SH-SY5Y, 2) MCF-7 and 3) U937 cells over □ 24, ■72, ■120 and ■168 h (n = 3 ± SD).Back to article page