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(A) TEM image of siNrf2-NBs (magnification 39,000×, scale bar 50 nm). (B) The gel retardation assay using electrophoresis on agarose gel of (a) naked siRNA, (b) blank NBs, (c) siNrf2-NBs, (d) siNrf2-NBs stored at 4 °C for 6 months, and (e) siNrf2-NBs after 6 h of incubation in PBS, pH 7.4.
