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. 2016 Dec 26;8(12):399–427. doi: 10.4252/wjsc.v8.i12.399

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©The Author(s) 2016. Published by Baishideng Publishing Group Inc. All rights reserved.

This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial.

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In vitro developed oocyte-like cells retrieve meiotically nonfunctional organelles from fibroblasts or satellite daughter cells. A: The in vitro developed oocyte-like cell (OLC) (o) with a lack of optically dense organelles (bold white arrow) is joined (arrowhead) by a fibroblast (fb) which provides organelles (B), but forms a fibro-oocyte hybrid causing oocyte regression (C); Alternatively, the OLC forms a satellite daughter (s in D), which is drained (black arrowhead and inset) and regresses (rs in E) when the OLC is saturated (black arrow). This results in the large OLC (F) with germinal vesicle (gv) and thick zona pellucida (zp), but provided organelles are not functional for resuming meiosis II. Panel F reprinted from[10]: ^©Antonin Bukovsky. Other panels adjusted from[50], with a permission: ^©Wiley-Liss, Inc.