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. 2016 Mar 24;16:22. doi: 10.1186/s12935-016-0296-3

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© Chen et al. 2016

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. 2 — The protein–protein interaction (PPI) of genes in cluster 1 (a), cluster 2 (b), cluster 3 (c) and cluster 4 (d). Green and red nodes represent genes that were decreased and increased, respectively. The different outer rings indicate genes in different clusters