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. 2017 Apr 13;7:46358. doi: 10.1038/srep46358

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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Bright-field X-ray image of (a) whole image and (b) magnified image. Results of analysis with (c) contrast analysis and (d) PSA. Exposure = 500 s. X-ray energy = 9.881 keV. Bar = 2 μm.