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a) Schematic illustration of the synthesis and cellular uptake of DOX-loaded PEG-PPS-cRGD CPNCs. b) MTT assay of SCC-15 cells after incubation with for 24 h (***P < 0.001). c) DOX concentrations in various organs and tumor tissue. (Reproduced with permission from Zhang et al. (2017). Copyright 2017, The Royal Society of Chemistry).
