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Morphology of U118 glioblastoma cells. (A) untreated cells (control group), cells treated with graphene oxide at concentration: 5μg/mL (B), 100μg/mL (C), and reduced graphene oxide at concentration: 5 μg/mL (D) and 100 μg/mL (E). Red * GO at cell membrane. Green ^ rGO at cell membrane. Light optical microscopy. Scale bars: 50 μm. (A–E). Abbreviations: GO: graphene oxide, rGO: reduced graphene oxide.
