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. 2018 Feb 13;8(1):14. doi: 10.3390/metabo8010014

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© 2018 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 (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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PCA separation of pre-80.5 km samples (C, n = 9) and post 80.5 km (E, n = 8) samples based on 446 ¹³C₂ glycine polar metabolites analyzed on a ZICpHILIC column (where p = pooled samples, n = 6). One post sample in the set is missing due to a technical failure. The data was Pareto scaled and log transformed.