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a The TEM image of RV@Ft-RGD. b, c The size distribution and zeta potential distribution of Ft-RGD and RV@Ft-RGD. d The PDI change of the RV@Ft-RGD in water, FBS, cell medium, and PBS over 20 days. e The absorbance spectra of free RV, Ft-RGD, and RV@Ft-RGD. f The absorbance spectra of free RV and RV@Ft-RGD
