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Assessment of the cytotoxicity of PLL-SPIONs. (A) Cell viability evaluated by the PrestoBlue assay. (B) Cell viability evaluated by the live-dead assay. (C–H) Representative images from the live-dead assay 72 h after co-incubation at all tested concentrations. Live cells were labeled green, while dead cells were labeled red. Scale bar = 100 μm. Data are expressed as means ± SD; *p < 0.05, **p < 0.01.
