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. 2021 Sep 7;9:694889. doi: 10.3389/fcell.2021.694889

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Copyright © 2021 Duque Rodriguez, Cittadini, Teplitz, De Stefano, Lombardo and Salamone.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A,D) Canine oocyte at 2-cell stage. (B,E) Canine oocyte at four-cell stage. (C,F) Canine oocyte at eight-cell stage. Parthenogenetic embryos visualized by bright field and Hoechst staining.