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Characterization of DX/NP. (a) Representative scanning electron micrographs of DX/NP. (b) Particle size distribution of DX/NP measured by the dynamic light scattering (DLS) method; Polydispersity index = 0.056. (c) Zeta potentials of the blank PLGA nanoparticles (■) and DX/NP (○).
