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Fluorescence images of organs from mice euthanized at different times after IONP-doped CPN administration. Fluorescence images of liver, spleen, kidneys and flank tumors at different time points (20.5, 1, 3, 6 and 24 h) after i.v. injection of CPFeNP (upper panels) and CPNiNP (lower panels). Control: PBS (1 h) image corresponds to organs from a mouse sacrificed 1 h after the injection of PBS.
