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. 2016 Jan 28;91:15–35. doi: 10.1007/s11103-016-0434-2

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© The Author(s) 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — Phloroglucinol staining for lignin detection (red) in intermediate and mature internode cross-sections in the pith and rind regions. RB867515: a, b, i and j; S. officinarum: c, d, k and l; S. robustum: e, f, m and n; S. Spontaneum: g, h, o, and p. MX metaxylem, PX protoxylem, Ph phloem, Fi fibers, E epidermis, PA parenchyma