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Fig. 1. Characterization of the FTY720@SPION/PFP/RGD-NB complex: (A) TEM image of the prepared NB complex, scale bar = 500 nm. (B) Size distribution of the prepared NB complex. (C) Size of the prepared NB complex changed with time (n = 7 days) at 4 °C and 20 °C.