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Schematic diagram of the surface architectures of the microparticle formulations (a) mPEG2000-DSPE/Biotin-PEG3350-DSPE (b) mPEG2000-DSPE/Thioctic acid-PEG3350-DSPE (c) mPEG5000-DSPE/Biotin-PEG3350-DSPE (d) mPEG5000-DSPE/Thioctic acid-PEG3350-DSPE
