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. 2018 Jul 10;37(9):1215–1229. doi: 10.1007/s00299-018-2319-0

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© The Author(s) 2018

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. 2 — Changes in the pattern of gene expression during procambium development in the first leaf of Arabidopsis. a Procambium development; black arrows show the directions of procambium emergence; b PIN1; black arrows indicate the direction of PIN1 protein polarity in the plasma membrane; red dots indicate cells with bipolar PIN1 localization; green regions in the epidermis represent auxin convergence points; c DR5 auxin-responsive promoter; the darker blue color shows a stronger DR5 expression; d MP; the darker violet color shows a stronger MP gene expression; e ATHB8; black arrows indicate the direction of its progressive appearance; I–X, successive stages of the venation development