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. 2021 Mar 1;8:47. doi: 10.1038/s41438-021-00483-5

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© The Author(s) 2021

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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Fig. 4 — Heatmaps showing the expression levels of lignin-biosynthesis-related genes at various growth stages. The expression values (FPKM) at the row scale were normalized. Higher mRNA expression levels are indicated by red, and lower mRNA expression levels are indicated by blue, whereas nonexpressed mRNAs are shown in gray; column diagrams show the levels of metabolites in the lignin biosynthetic pathway