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Twenty-four-hour cytotoxicity assay using HeLa cells at increasing Magnevist and GO concentrations. No significant cytotoxicity was observed up to a Magnevist concentration of 35 mM and a GO concentration of 250 μg/mL. The maximum GO dose required for cellular delivery enhancement is 20 μg/mL, or an order of magnitude below the highest tested dose. The 150 nm GO was used for the study.
