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. 2019 Jul 12;10:64. doi: 10.1186/s40104-019-0360-7

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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. 2 — Immunohistological analyses of germ cell differentiation in the yak testis at four different developmental stages. a Immunostaining for Ki67 in testicular sections from yaks at 3 and 5 months. b Immunostaining for PLZF in testicular sections from yaks at 3, 5, 8 and 24 months. c Quantification of PLZF⁺ cells per seminiferous tubules at four different developmental stages. Negative control was shown in the lower-left corner. Different letter denotes significantly different at P < 0.05. Scale bar = 50 μm