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Characterization of MMP-2-PLGA-PEI nanoparticles. (A) Size distribution in aqueous solutions; (B) Stability tests at 37 °C in water and physiological solution (PBS, pH 7.4); (C) Transmission emission microscopy (TEM) images of the nanoparticles; (D) Scanning electron microscopy (SEM) images of the nanoparticles.
