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. 2021 Apr 21;22(9):4300. doi: 10.3390/ijms22094300

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© 2021 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 (https://creativecommons.org/licenses/by/4.0/).

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Primary metabolic alterations under Pb exposure. The color code (green: increased in NM-Control roots; red: increased in M-Pb roots; blue: increased in M-Pb roots; white: nonsignificant change or not detected) is used to represent changes in the abundances of the identified enzymes (involved mainly in glycolysis and TCA) and selected metabolites according to three independent T tests: NM-Control vs. NM-Pb (1), NM-Control vs. M-Pb (2) and NM-Pb vs. M-Pb (3; square boxes from left to right). The most important changes are marked with a larger font.