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Effect of graphene oxide (GO) and reduced graphene oxide (rGO) on U87, U118, U251 and T98 GBM cell lines and HFFF-2 human fibroblast viability. Bars represent the means with standard deviation (SD) (n = 3). Notes: Different lowercase letters (a and b) within columns indicate significant differences between the concentrations (p < 0.05). Abbreviations: GO: graphene oxide and rGO: reduced graphene oxide.
