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The ratio (%) of seminiferous tubules with BrdU-labeled spermatogenic cells in different spermatogenic stages. The number of seminiferous tubules at each stage containing more than one BrdU-labeled spermatogenic cell against that of the total number of seminiferous tubules at the same stage per section was calculated in three different sections from the same animal. Each value represents the mean ± SD of three sections. *p<0.05 indicates a significant difference.
