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. 2017 Aug 21;7:8987. doi: 10.1038/s41598-017-09344-5

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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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Three-dimensional model of the sclerodermite organization. Black dots and lines represent RADs and needles, respectively. On the right panel, the left part of the front surface corresponds to a yellow colour-coded transcurrent layer (as defined in Fig. 4) while the right part corresponds to a red colour-coded transcurrent layer. Because sclerodermites form three-dimensional bundles expanding towards all free directions, needles growing from RADs lying slightly off-axis with respect to the radial growth direction intersect the acquisition surface at high angles and form the multi-coloured patches visible in Fig. 2. They do not, however, interrupt the continuity of transcurrent layers. R and L as in Fig. 2. Artwork by A. Lethiers, used with permission.