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. 2019 Jan 16;19:25. doi: 10.1186/s12862-018-1322-y

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© The Author(s). 2019

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 — Crossing scheme applied between mice that derive from the Buchs (CHBU) and Hünikon (CHHN) races. Male offspring were sacrificed and sperm counts were performed. Female offspring were backcrossed to a male of the CHHN race. After the first backcross, not all offspring were processed equally (stars). Fewer offspring were analysed if their mother was fully fertile (see text)