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Assessment of the toxicity of SPIONs after, (a) 24 h incubation only, and (b) after 24 h incubation followed by 48 h of recovery in supplemented culture media; viability compared to untreated cells (control, 100% viability). The 50% viability of control cells (untreated) is represented by the red line. The viability of cells treated with 10 µM doxorubicin (positive control) is shown by the green line.
