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Gel electrophoresis assay of NP/DNA complexes. Lane 1: marker; Lane 2: naked DNA (ND); Lanes 3–4: GS/DNA complexes; Lanes 5–6: GS-PEG-Apt/DNA complexes; Lanes 7–8: GS-PEG/HA2-Apt/DNA complexes. Complexes with GS/DNA weight ratio of 200 (lanes 3, 5, and 7) and 100 (lanes 4, 6, and 8) were investigated in deionized water
