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. 2017 Jan 31;15:10. doi: 10.1186/s12951-017-0247-8

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© The Author(s) 2017

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. 2 — Surface characterization of the acid-etched rough Ti6Al4V surface. a FE-SEM micrograph illustrating a low magnification view of the rough material; b high magnification of the etched surface showing irregular patterns of valley-peaks with stretch marks; and c AFM micrograph representing the rougher and asymmetrical surface