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. 2020 Oct 9;20:464. doi: 10.1186/s12870-020-02648-1

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Identification of putative cis-acting regulatory elements (CREs) in the promoter regions of BnNRT2 family genes. a The abundance of CREs in the promotor regions (2000 bp genomic sequences upstream the start codon) of BnNRT2s were determined in the WordArt program. Font size increases with the abundance of CREs. b Genomic distribution of CREs in promotor regions of BnNRT2s. Boxes filled with different colors represent different CREs