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Schematic illustration of pH/redox potential dual-response-mediated drug release for tumor treatment. Black dots represent the drug molecules. Drugs are encapsulated inside the nanoparticles (red) and also adsorbed on the surface of nanoparticles (NPs). When endocytosis occurs, and nanoparticles are responding to a stimulus such as pH or redox potential, this may promote a drug release inside the cell.
