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. 2016 Oct 21;10:97. doi: 10.1186/s12918-016-0343-7

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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. 1 — High exaptation potential in central carbon metabolisms. a Fraction of metabolisms with exaptation index I>0 (y-axis) viable on some carbon source C (x-axis); b fraction of metabolisms (coded by shade of grey, see legend) with exaptation index I>0 that are viable on some carbon source C (x-axis) and have a given size (y-axis), c mean exaptation index of metabolisms viable on some carbon source C (x-axis), and d mean exaptation index (coded by shade of grey, see legend) of metabolisms viable on some carbon source C (x-axis) and with a given size (y-axis). White in (b) and (d) corresponds to metabolisms whose size is too small for viability on C