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Cytotoxicity assay of the FA-GNC-Pt nanoparticles in 4T1 cells. (a-b) MTT assay determined relatively cell viability of 4T1 cells after treated with the FA-GNC-Pt nanoparticles for (a) 4 or (b) 36 h; (c) MTT assay determined IC50 value of CDDP, MDDP, GNC-Pt and FA-GNC-Pt post 36 h incubation (** p < 0.01); (d-k) Cellular apoptosis induced with CDDP, MDDP, GNC-Pt or FA-GNC-Pt examined post (d-g) 4 h or (h-k) 36 h incubation.
