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. 2019 Aug 19;9:12017. doi: 10.1038/s41598-019-48453-1

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Principal component analysis (PCA) of the adult (a) and baby (b) giant panda fecal metabolomes, extracted using six different solvents. Each color represents an extraction method. Red colored dots represent ACN (100%); green colored dots represent MeOH (100%); blue colored dots represent MeOH (80%); cyan colored dots represent ACN:CHCl₃ (3:1); Purple dots represent IPA:ACN:H₂O (3:2:2); and yellow dots represent MeOH:CHCl₃ (3:1). An ellipse with dotted lines indicates the 95% confidence interval calculated by Hotelling’s T2 statistics.