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Evaluation of nucleic acid binding and protection capability of (A) PEI800, (B) PEI25K, (C) PEI‐DA and (D) PEI‐DA‐TAT at different N/P ratios (N/P ratios of 0.5, 1, 5, 10 and 50 from lanes 1–5). The left end lane, naked DNA, was used as a control. Exposure time: 400 ms.
