Fig. 3. In vitro release profiles of FTY720 from FTY720@SPION/PFP/RGD-NB complexes with or without the promotion of LIFU (output power of 0.8 1.6 or 2.4 W cm−2, 1 MHz, duty cycle of 50% and an exposure time of 60 s) at 37 °C, pH 7.4.
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