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Ex vivo fluorescence imaging of brain and major organs. Fluorescence imaging (a) and intensity (b) of brains collected at 24 h after intravenous injection of NPs or PNPs, *** p < 0.001 compared with NPs. Fluorescence imaging (c) and intensity (d) of liver, heart, spleen, lung and kidney of tumor-bearing mice collected at 24 h after intravenous injection of NPs or PNPs.
