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Morphology of U87, U118, U251 and T98 glioblastoma and HFFF-2 cells treated with GO + mimic miRNA-124, GO + mimic miRNA-137, GO + antisense miRNA-21, GO + antisense miRNA-221 and GO + antisense miRNA-222. Abbreviations: GO: graphene oxide. Scale bars: 50 μm.
