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. 2017 Dec 19;7:17849. doi: 10.1038/s41598-017-18173-5

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Characterization of the surface of the SLA and SLA-Dopa titanium implants. (a,b,c,d) SEM showed partial aggregates of polymerized Dopa (indicated by red arrows) were located between or in the cavities of the Dopa-modified SLA surfaces. (e) XPS analysis showed the Dopa-coated sample contained a peak corresponding to nitrogen (N1s), attributed to the amine group of Dopa.