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. 2022 Mar 24;9:820799. doi: 10.3389/fnut.2022.820799

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Copyright © 2022 Ding, Xu and Li.

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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Scatter plot of PCA scores of all fecal samples (including QC samples). (A,B): positive ion mode; (C,D): negative ion mode. A: NT-free group; B: basal diet group; C: NT intervention group; D: model control group.