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Intracellular fluorescence of MDA-MB-231 (a) and MCF-7 (b) cells determined by FCM following treatment with either free C6 or C6/NPs, respectively, for 1, 2, and 4 h. Representative cellular uptake images of MDA-MB-231 (c) and MCF-7 (d) cells after incubation with free C6 and C6/NPs for 4 h by CLSM observation. Images of cellular internalization of C6/NPs in MDA-MB-231 cells after pretreatment with endocytosis inhibitors (e). Note: *p < 0.05 C6/NPs versus free C6 group
