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Dispersion stability of mPEG-coated GNRs versus exposure to 20 mM mercaptoethanol, based on absorption spectroscopy (a and b; incubation at 25°C) and NTA (c and d; incubation at 37°C). (a,c) GNRs coated with thiolated mPEG (5 kDa); (b,d) GNRs coated with DTC-mPEG.
