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. 2018 Sep 26;22:29. doi: 10.1186/s40824-018-0139-5

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© The Author(s). 2018

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 10 — Coumarin-6 release profile from (bPEI/BCM), (GO/BCM), and (bPEI/BCM/GO/BCM) films in PBS buffer containing ethanol (2:1 PBS/EtOH) at a pH 7.4 and b pH 2. (Reprinted with permission from Ref. [32]. Copyright 2016, Nature)