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. 2016 Dec 5;11:539. doi: 10.1186/s11671-016-1755-4

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 4 — Release profiles of pH-responsive CA-PEI-pArg PMs at a pH 7.4 and b pH 5.0 (mean ± SEM, n = 3)