the study is based on examinations of surgical testicular biopsies performed in eleven men aged from 19-79 years ( 300 cells at leptotent stage , 19 at zygotene , 300 cells at pachytene , 490 spermatocytes at diakinesis/first metaphase and 23 cells at the second metaphase of meiotic division ) , as well as post-mortem necropsies taken from six men aged from 19-51 years ( 6,000 cells at the first meiotic prophage ) .
C0007634
cells
C0007590
cells