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Characterization of HA-P-PEI/siRNA nanoparticles. Gel-retardation assay of PEI/siRNA (A), HA-PEI/siRNA (B) and HA-P-PEI/siRNA (C) at different N/P ratios. TEM and DLS results for the HA-PEI/siRNA (D, G) and HA-P-PEI/siRNA nanoparticles before (E, H) and after (F, I) MMP-2 treatment for 6 h (J) Serum stability of Free siRNA, PEI/siRNA, HA-PEI/siRNA and HA-P-PEI/siRNA.
