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Immunofluorescence staining (CD31, green) of frozen U87MG tumor tissue slices from mice after 4 h p.i. of (A) QD800-RGD, (B) QD800-PEG, or (C) QD800-RAD. Arrows point to QD800-RGD nanoparticles staying within the tumor angiogenic vessel. Magnification: 400×.
