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GNR binding and uptake by (A) high-resolution dark field microscopy and (B) ICP-MS after 24 h incubation with either RGDfK modified or untargeted GNRs (10 μg/mL). RGDfK-GNRs show increased binding and uptake relative to untargeted GNRs in both cell lines; however, this difference was most significant (roughly 20-fold) with HUVECs.
