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(a) Uptake efficiency of SNPs of various sizes (from 35 to 350 nm) by the U87 cell line. (b) Uptake of 35-nm RGD-SNPs of various RGD ligand coverages (from 0 to 10%) by U87 and MCF7 cell lines. (c) Fluorescence microscopy images of 35-nm RGD-SNPs 7 (5% RGD ligand coverage) taken up by U87 and MCF7 cell lines. The cell nuclei were stained by DAPI; the RGD-SNPs 7 were labeled with Cy5 units.
