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SPERMATOGONIAL STEM CELL RENEWAL IN THE MOUSE: II AFTER CELL LOSS

The repair of the mouse seminiferous epithelium after cell loss has been studied in seminiferous tubules mounted in toto. Cell loss was inflicted by injection of Myleran in a dose of 10 mg/kg body weight. In stages 7–8, in which we mainly counted, the numbers of Aisolated (Ais), Apaired (Apr), Aaligned (Aal) and A1 spermatogonia and resting primary spermatocytes decreased after injection. After about 24 days normal numbers of A1 spermatogonia were found again. Thereafter a substantial overshoot in the number of A1 spermatogonia was found.