Fig. 2. Schematic of the coarse grain scheme for the redox-responsive chemo-photodynamic NPs: the bead model of PEG–S–S–DOX for which seven beads were defined to constitute one PEG molecule “P”, two beads represent the disulfide bond “S”, one DOX molecule was divided into seven beads “D”. One single photosensitive drug Ce6 molecule was designated to show eight beads “C”.
