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. 2017 Nov 21;17:214. doi: 10.1186/s12870-017-1150-z

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© The Author(s). 2017

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. 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.

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Fig. 11 — The contents of betulinic acid, oleanolic acid and betulin in BpbHLH9 transgenic birch. The reported values are the means of three replicates, and the vertical line on top of each bar indicates standard error