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In vivo IVIS imaging of GRPr-expressing PC-3 xenografts with 68Ga-HZ220. PC-3 tumor–bearing mice were imaged for 500 ms at 1 h after injection of 68Ga-HZ220 with IVIS spectrum (n = 4) (A and B) and 68Ga-HZ220 plus excess of unlabeled ligand (n = 3, C and D).
