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. 2018 Nov 15;9:1304. doi: 10.3389/fphar.2018.01304

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Copyright © 2018 Huang, Yao, Leung, Wang, Kong, Wang, Dong, Chen and Tsim.

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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PCA analyses of (A) HPLC and (B) ¹H NMR profiles of signals from the 15 spleen-meridian herbs. The distribution of each herbal extract in score scatter plots was calculated according to its correlation with the major components. The classification of herbal extracts was according to the proposed pharmacological activity, as described in TCM practice. The results showed very low discrimination between different types of herbal extracts.