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. 2017 Jul 14;17:27. doi: 10.1186/s12898-017-0137-9

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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 — Stable isotope values of carbon (δ¹³C_collagen) and nitrogen (δ¹⁵N_collagen) from collagen tissue of male and female bison. Open symbols represent males, and filled symbols represent females. Bold diamonds with bars represent mean ± 1 standard deviation, while lighter diamonds represent raw data