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. 2013 Jul 4;3(3):539–551. doi: 10.3390/metabo3030539

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© 2013 by the authors; licensee MDPI, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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OPLS-DA score plot for malignant SPNs patients (n = 17), benign SPNs patients (n = 15) and healthy controls (CN, n = 20) based on LC/MS data. A: positive mode (R²Y = 0.982, Q² = 0.838), B: negative mode (R²Y = 0.967 and Q² = 0.815). The x-axis and y-axis indicate the first principal component and second principal component, respectively.