nuclei show seven autosomal bivalents with one or two terminal or interstitial chiasmata, and one sex univalent (Fig.
Stage III (c) presents zygotene spermatocytes (Z), pachytene spermatocytes (P), diplotene
spermatocytes (D), elongated spermatids (E), and Sertoli cells (S).
To summarize, the cell subtype percentages of zygotene and diplotene
for CBZ-, IPR- and CCK-treated cell cultures followed the same decreasing trend compared with controls.
Indeed, in one experiment she had to sacriice 125 females to obtain 30 diplotene
In Gagrella unicolor male meiosis the sex chromosomes are seen as one or two heteropycnotic bodies at early prophase I and as a heteromorphic pair from diplotene
to metaphase I; furthermore they precede the migration of autosomes at both meiotic anaphases (Sharma and Dutta, 1959).
Dspite its infancy to preserve fertility and lack of studies, ovarian tissue cryopreservation has several potential advantages, such as the presence of many primordial follicles with oocyte arrest in diplotene
of prophase of the first meiotic division, primordial follicles being theoretically less cryosensitive than mature oocyes, and preservation of the endocrinal function of the ovary.
The oocytes are arrested in the dictate stage, a prolonged diplotene
stage of the first meiotic division also known as the germinal vesicle stage.
SYCP2 and SYCP3 are required for cohesin core integrity at diplotene
but not for centromere cohesion at the first meiotic division.
Sertoli cell-selected AR knockout mice exhibit spermatogenesis arrest at the diplotene
stage [1-3], similar to the phenotype of AR knockout mice.
El nucleo ovocitario presenta un prominente (nucleolo y los cromosomas en configuracion diplotene
1B) and, in diplotene
, they form 10 autosomal bivalents.
1 b) appears entirely heterochromatic (positively heteropycnotic) from early diplotene