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. 2017 Aug 22;7:9034. doi: 10.1038/s41598-017-08690-8

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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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Anatomy of an elongating internode of M. lutariorioparius. Sections from three segments of the 2^nd internode from top were stained with Toluidine Blue O and observed under bright field. (A) upper internode (UI), (B) middle internode (MI), (C) basal internode (BI), (D,E and F) represent the magnified view of a vascular bundle in A, B, and C, respectively. Arrow head indicates the thickened fiber cells. Cc, companion cells, Pa, parenchyma, Sf, sclerenchyma fiber, St, sieve tube, V, vessel. Scale bar 100 μm in (A–C), and 50 μm in (D–F).