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Stage I (a) shows type A spermatogonia (A), leptotene spermatocytes (L), pachytene primary spermatocytes (P), round spermatids (R), and Sertoli cells (S).
The movement of preleptotene/ leptotene spermatocytes across the blood-testis barrier (BTB), also known as the Sertoli cell barrier, during the seminiferous epithelial cycle is one of the most important cellular events taking place in the mammalian testis.
Similar results were found in both species, briefly: [gamma]-H2AX domains appeared by late leptotene as massive accumulations at the spermatocyte nucleus, where the synapsis of autosomes begins.
Results: The frequencies of leptotene and zygotene stages were significantly higher in patients (7.95 and 9.75%) than in controls (2.30 and 1.45%), whereas the frequency of pachytene was significantly higher in controls than in patients (96.25 vs.
It then progresses through the first meiotic prophase, which consists of leptotene, zygotene, pachytene, and diplotene phases.
In the primary spermatocyte (3.1-3.6 [micro]m) is possible to see 4 stages of early prophase: leptotene, zygotene, pachytene and diplotene.
Leptotene The early stage of meiosis during which the chromosomes shorten and appear as long, separated filaments.
The primary spermatocyte consists of 5 stages: leptotene (LSc), zygotene (ZSc), pachytene (PSc), diplotene (DSc) and metaphase (MSc) (Figs.