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. 2020 May 20;11:741. doi: 10.3389/fphar.2020.00741

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Copyright © 2020 Si, Zhou, Shen and Luan

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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Multivariate statistical analysis of UPLC-MS data in negative ion mode. (A) PCA score plot; (B) OPLS-DA score plot; (C) S-plot of OPLS-DA model; (D) VIP-plot of OPLS-DA model.