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. 2019 Oct 16;7:234. doi: 10.3389/fcell.2019.00234

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Copyright © 2019 van der Horst, Kotzé, O’Riain and Maree.

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) Sertoli cell with vast number of fluid-filled vesicles in its cytoplasm. Nucleolus of Sertoli cell is surrounded by peri-nucleolar chromatin (arrow). (B) Dividing Sertoli cells (arrow) between two spermatogonia. Similar dividing Sertoli cells are common in all males studied. (C) A type spermatogonium (A Sg) and B type spermatogonium (B Sg). (D)Leptotene primary spermatocyte. (E) Early pachytene primary spematocyte. (F) Mid-pachytene primary spermatocyte showing paired chromosomes.