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. 2017 Mar 29;8:188. doi: 10.3389/fphys.2017.00188

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Copyright © 2017 Liu, Wang, Chen, Huang, Yang, Ahmed, Wang, Liu and Chen.

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) or licensor 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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Electron micrographs of various germ cell types undergoing apoptosis during spermatogenesis. (A,B) Apoptotic spermatids in April, (C,D) apoptotic spermatocytes in July, (E) apoptotic spermatids in October, (F) apoptotic spermatocytes in October. Arrowhead, spermatogonia; Double arrowhead, spermatocyte; Double arrow, spermatid; Fl, flagellum; LD, lipid droplet; Bv, blood vessel; Mi, mitochondria; N, nucleus. Scale bar = 10 μm (C), 5 μm (A,D), and 2 μm (B,E,F).