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Biodistribution of 68Ga-DOTA-PEG4-LLP2A (5.55 MBq, 277 ng) in B16F10 tumor-bearing mice at 1 h postinjection, with or without excess LLP2A-PEG4 as a blocking agent (n = 4) (A). Tumor/blood and tumor/muscle ratio of 68Ga-DOTA-PEG4-LLP2A (B).