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Table 1 The 12 stages of the seminiferous epithelial cycle of an adult mouse

From: Does co-transplantation of mesenchymal and spermatogonial stem cells improve reproductive efficiency and safety in mice?

  Stages
I–IV V–VI VII–VIII IX X–XI XII
Level 3 Elongated spt Elongated spt Elongated spt    
Level 2 Round spt Round spt Round spt Elongated spt Elongated spt Elongated spt
Level 1 Pachytene spc Pachytene spc Pachytene spc Pachytene spc Pachytene and diplotene spc 2nd meiotic division
Level 0 (basement membrane) Intermediate spg B-spg Preleptotene spc Leptotene spc Leptotene and zygotene spc Zygotene spc
  1. Spt spermatid, spc spermatocyte, spg spermatogonia