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. 2021 Mar 2;11:4989. doi: 10.1038/s41598-021-84051-w

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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TEM micrograph of a longitudinal section of an apoptotic sperm showing altered nucleus with marginated chromatin (mCh) and the presence of a wide hole, a typical morphological characteristic of apoptosis. The acrosome does not completely fit with nuclear shape, a cytoplasmic residue (CR) and a section of an altered axonemal pattern are visible. Bar: 2 µm.