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It was observed (1) that reversible meiotic changes did in fact take place following vasectomy, as evidenced by the changing profile of the various stages of meiosis, resulting in a spermatogenic arrest accompanied by a drop in the frequency of mature spermatids and depletion of spermiocytes. (2) By 15 weeks postvasectomy, repair had progressed from the earlier meiotic stages, with a return to the normal, control, meiotic distribution. (3) The time from the observation of degenerative changes to the restoration of control values, according to our data, was approximately 100 days.
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