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. 2011 Feb 23;12(2):1371–1388. doi: 10.3390/ijms12021371

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© 2011 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 4. — Gel retardation assay of PLA-PEG-PLL NPs/DNA complexes prepared at different N/P ratios. Lane 1: Naked DNA; Lane 2–7: The N/P ratios of PLA-PEG-PLL NPs/DNA complexes was 9:1, 12:1, 15:1, 18:1, 21:1 and 24:1, respectively.