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Typical transmission electron microscopy images of DOTA-PEG-AuNCs with an edge length of (a) 54.5±4.4 nm and (b) 30.3±4.2 nm; (c) fast protein liquid chromatography analysis of the 30-nm 64Cu-DOTA-PEG-AuNCs; and (d) longitudinal specific activities of the 64Cu-DOTA-PEG-AuNCs after incubation at 4 ºC for different periods of time.
