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Silver staining of integrin αvβ3 overexpressing U87 glioma cancer cells with PBS (A), NS–PEG5K (B), and NS–RGDfK (C) solutions. Images were taken by light microscope with 40× magnification.
Abbreviations: NS, nanoshell; PBS, phosphate buffered saline; PEG, polyethylene glycol; RGDfK, Arg-Gly-Asp-D-Phe-Lys.
