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. 2017 Jul 14;5:77. doi: 10.1186/s40168-017-0297-z

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — Correlation matrix of microbiota to tryptophan and cellular processes. a Significant correlations among genera and tryptophan metabolism, apoptosis, and bacterial invasion of epithelial cells are shown. The significant Spearman correlation coefficients are displayed as ellipses. Let and right directions of ellipses indicate positive and negative correlations, respectively. b The bar graph shows the prediction analyses of tryptophan metabolism. (**p < 0.05 for milk diet in comparison to sow-fed, ^# p < 0.05 for milk diet in comparison to soy diet)