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. 2018 Oct 24;8:15720. doi: 10.1038/s41598-018-34105-3

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© The Author(s) 2018

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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Two non-sheathed capillaries arising from an arterial vessel proximal to a capillary sheath. The non-sheathed capillaries are marked in white colour. All non-connected structures were removed. (a) Part of R3 seen from the last section in the series. (b) Part of R8 seen from the first section in the series. (a) and (b) show staining for CD34 plus SMA in yellow, for post-arteriolar CD271⁺ capillary sheaths in green and for capillary sheaths of undetectable location in blue. In (a) the blue structure in the lower right part corresponds to CD271⁺ FDCs in follicles. The direct connections of arterial vessels to green sheaths were manually marked in red. Length of the horizontal part of the bounding box = 882 µm in (a) and 709 µm in (b).