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. 2022 Jul 14;12:12066. doi: 10.1038/s41598-022-14850-2

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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 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/.

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Gene ontology (GO) annotation of differentially expressed genes in the roots of walnut seedlings under nitrogen starvation (a) and excess (b). The ordinate represents the number of genes, and the abscissa represents the GO terms. Red bar: number of upregulated genes; blue bar: number of downregulated genes.