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To elucidate the processes involved in the spatial and temporal maturation of spermatogenic cells in the testes of the soft-shelled turtle, Pelodiscus sinensis, we used a histological morphology method, TdT-mediated dUTP nick end-labeling (TUNEL) assay, the proliferating-cell nuclear antigen (PCNA), and electron microscopy. Seminiferous tubules from 100 turtles, normal for size of testes and semen...
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