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Viability of cells after 24 h of exposure to the graphene family materials, determined by the ATP assay. Results are presented as the % of control (mean with standard variation). A statistically significant difference between a group and the control was marked as * p < 0.05, ** p < 0.01, *** p < 0.001. Blue bars, GN; orange bars, nGO; grey bars, GO.
