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DNase‐I protection assay for modified MSNs with amine and imidazole groups
(a) Agarose gel retardation assay after DNase‐1 treatment of the samples: free pDNA or pDNA complexes with MCM‐41‐NH2 or MCM‐41‐Im in N /P ratios of 0.5 and 1, (b) Retained pDNA in the wells that were extracted from the gel following DNase‐1 treatment and investigated again by gel electrophoresis
