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. 2018 Sep 20;8:14109. doi: 10.1038/s41598-018-32472-5

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© The Author(s) 2018

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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Physiological and metabolic data related to onion bulb pigmentation. (a) Detailed Cy and Del metabolic network showing subsets of nodes or metabolites that constitute this process. Enzyme and unigene names as well as expression patterns are listed next to each step, while expression patterns are summarized in two boxes; the PRKM values for dark-red onions are on the right, while the log2 expression ratio of white/dark-red are on the left; (b) Transcript accumulation of color-related genes involved in the anthocyanin metabolic process; (c) Gene expression correlation analysis for color-related genes in dark-red onion based on qRT-PCR and RNA-seq. Abbreviations as in Fig. 1.