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Internalization of Au-PEG NPs by A549 cells and HUVECs. A549 cells and HUVECs were incubated with Au-PEG NPs of cNP = 0.6 nM and cNP = 1 nM concentration cells in medium with (white bars) or without (black bars) serum. Twenty-four hours after adding the particles, the gold concentration cAu and the protein concentration CP was determined.
