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. 2019 Aug 22;12:77. doi: 10.1186/s13048-019-0553-x

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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 — Comparison on apoptosis staining between the freezing groups and fresh groups (TUNEL, × 400). (a) Apoptosis positive primordial follicle in the vitrification freezing group. (b) Apoptosis positive primordial follicle and primary follicle in the programmed freezing group. (c) Apoptosis negative primordial follicle in the fresh control group