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. 2021 Mar 2;11:4957. doi: 10.1038/s41598-021-84518-w

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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 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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Expression stability and rankings of reference genes in Liriodendron hybrids as calculated by geNorm in the somatic embryogenesis (black) and the germination (blue) groups. Genes with the most constitutive expression are indicated on the right side of the graph, with the less stably expressed genes on the left.