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Although mammals produce either sperm or eggs depending on their sex, we found oocytes in the testes of newborn MRL/ MpJ male mice. In the present study, we report the morphological characteristics of testicular oocytes, the postnatal change of oocyte number per testis, and the expression of a few oocytespecific genes in the testes of MRL/MpJ mice. The testicular oocytes had a diameter of 50-70 lm and were surrounded by zonae pellucidae, which were observed between oocytes and folliculardoi:10.1095/biolreprod.107.064519 pmid:18354036 fatcat:wvcblrzv7feqpivsj3i2dk2wdu