Fig. 5

a Confocal fluorescence images of MCF-7 cells after cell incubation with DOX/Z-ICG-FA for 2 h and 4 h. Scale bars: 10 μm. b Confocal fluorescence images of MCF-7 cells after cell incubation with DOX/Z-ICG or DOX/Z-ICG-FA for 4 h. The cell nuclei were stained with Hoechst 33342. Scale bars: 10 μm. c Flow cytometric quantification of the cellular uptake of Z-ICG-FA, DOX/Z-ICG or DOX/Z-ICG-FA