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. 2022 Apr 13;9:878249. doi: 10.3389/fnut.2022.878249

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Copyright © 2022 Hong, Zhao, Yin, Nie and Xie.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Deuterium labeling of galacturonic acid (GalA) and methyl-esterified GalA during a two-step reduction procedure, reprinted with the permission from Springer Nature (25).