Fig. 6

a CLSM images of MDA-MB-231 cells incubated with 15 µg/mL, 20 µg/mL, 25 µg/mL Au @PDA-PEG-MTX; b Single channel image of the uptake of 15 µg/mL, 20 µg/mL and 25 µg/mL Au @PDA/FITC-PEG-MTX; c Quantitative calculation of the uptake of Au @PDA/FITC-PEG-MTX through FCM (***p < 0.001, ****p < 0.0001)