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. 2016 Oct 28;17:223. doi: 10.1186/s13059-016-1080-3

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© The Author(s). 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. 8 — Amino acids under positive selection in C₄ lineages. (a) PEPC and (b) PEPCK amino acid sequences for C₃ and C₄ grass species. Amino acids are color-coded according to their chemical properties: black, non-polar; red, polar; green, acidic; blue, basic. C₄ amino acids are bolded. Figure modified from Christin et al. [4, 65]