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. 2016 Nov 5;23:77. doi: 10.1186/s12929-016-0284-x

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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. 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. 3 — Biomimetic apatite coating formed on surface functionalized polymeric substrates (a): poly(methyl methacrylate) (ref: 121, with permission from Elsevier); (b):chitosan (ref: 120; with permission from Elsevier); (c): poly(vinyl alcohol) with permission from Elsevier (ref: 122); (d): poly(hydroxy ethyl methacrylate-co-methyl methacrylate); (e): high magnification image of (d)