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(A) Schematic diagram of DiO/DiI (1:1) NPs with each at 0.5% weight ratio of the polymer and (B) fluorescence spectra of DiO/DiI NPs with 10-fold dilution in water (red) and acetone (green). Reproduced with permission from Chen, T.; Li, C.; Li, Y.; Yi, X.; Wang, R.; Lee, S.M.Y.; Zheng, Y. Small-sized mPEG–PLGA nanoparticles of Schisantherin A with sustained release for enhanced brain uptake and anti-parkinsonian activity. ACS Appl. Mater. Interfaces 2017 [118].
