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. 2016 Jul 4;11:323. doi: 10.1186/s11671-016-1532-4

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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. 5 — X-ray photoelectron spectra of hydroxyapatite nanorods without (a) and with glutamic acid (b), PLGA (c), collagen (d), and mixed fibrous multilayered scaffolds of PLGA and Col-HA (e)