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. 2017 Mar 23;17:86. doi: 10.1186/s12862-017-0902-6

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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. 3 — Similarity of gene expression profiles among species. Pairwise Spearman coefficient values for forelimbs at the (a), bud (b), paddle (c) stages for all species, and for the hind limbs of the ridge (d), bud (e), paddle (f) stages for all species. M. = mouse, O. = opossum. Abbreviations for stages and species are as in the legend for Fig. 2. In each label for the heat map, Stage 2 corresponds to ridge, Stage 3–4 to bud, and Stage 6 to paddle