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Comparison of targeted (RGDfK) and untargeted gold content by ICP-MS in (A) blood and (B) tumors of mice bearing prostate cancer xenografts at 6, 24 and 48 h post-injection. After 6 h, the RGDfK-GNRs were mostly removed from the blood, while the same was true for untargeted GNRs after 24 h.
