Calendar of Gametogenic Development in the Prepuberal Male Mouse

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Science  22 Sep 1961:
Vol. 134, Issue 3482, pp. 832-833
DOI: 10.1126/science.134.3482.832


The timing of the first meiotic cycle in the young male mouse was established by serial sacrifices and subsequent paraffin sectioning of testis and epididymis. Meiosis commences in mice 8 to 10 days old. The highest frequency of any one phase of meiosis was found at days 17 to 19, when 47 percent of the tubules were found to contain late pachytene.