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. 2019 Aug 28;20(17):4212. doi: 10.3390/ijms20174212

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Network of metabolite-metabolite correlation based on significant correlations. Nodes stand for metabolites and edges stand for metabolite relationship. Red edges mean negative correlation, and grey edges mean positive correlation. The nodes in different color mean different metabolite type. HN-IE and HN-RE are samples from innermost endosperm region and the remaining endosperm region under high nitrogen treatment, respectively. LN-IE and LN-RE are samples from innermost endosperm region and the remaining endosperm region under low nitrogen treatment, respectively.