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. 2017 Aug 3;7:7188. doi: 10.1038/s41598-017-07694-8

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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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Micro-CT allows objective discrimination of the human sinus node. This figure demonstrates high resolution (28 × 28 × 28 µm³) micro-CT data from part of the right atrium containing the sinus node. For this figure, the sinus node is outlined in yellow in short-axis micro-CT sections (c,d) and in matching histological sections taken from the same sample (a,b). The plane of section in c and d is shown on the 3D volume rendering (endocardial view) (e). The sections are available to view without the outlines in the supplementary Fig. S2. CT- terminal crest, ICV- inferior caval vein, PcM- pectinate muscles, SCV- superior caval vein, SN- sinus node, *- indicates epicardial fat.