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Representative single-photon emission computed tomography (SPECT) images of balb/c mice intravenously injected with 37 MBq of GS-[198Au]AuNPs at A) 10 min, B) 1 h, C) 4 h, and D) 24 h p.i. Reproduced with permission from Ref. [70]. Copyright 2012, John Wiley and Sons.
