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Glioblastoma multiforme tumor cultured on chorioallantoic membrane. (A,C,E) control group; (B,D,F) pristine graphene treated group. (G) U87 tumor volume, weight, and mitotic index in the control (C) and pristine graphene (GPs) groups. Notes: Black arrows point to graphene agglomerates. The columns with different letters (a–b) indicate significant differences between the groups.
