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. 2019 Dec 3;9:410. doi: 10.3389/fcimb.2019.00410

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Copyright © 2019 Ma, Mao, Chen, Zhao, Wu, Song, Li, Zhu, Fan, Yi, Ding, Zhao and Chen.

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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Sample score diagrams of group S and group C and OPLS-DA model replacement test diagrams under the positive (ESI+) or negative ion mode (ESI−). (A) The PCA score chart of group S and group C samples under ESI+. (B) The PCA score chart of group S and group C samples under ESI−. (C) The replacement test of group S and group C samples under ESI+. (D) The replacement test of group S and group C samples under ESI-. (E) The PLS-DA score chart of group S and group C samples under ESI+. (F) The PLS-DA score chart of group S and group C samples under ESI-. (G) The OPLS-DA score chart of group S and group C samples under ESI+. (H) The OPLS-DA chart plot of group S and group C samples under ESI-.