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1. The spermatogonium remained replicating activity of DNA during the developing stage.

2. Mouse spermatogonium chromosomal aberration test and sperm malformation test were used to assess reproductive toxicity.

3. Chromatin hetropycnote partly in spermatogonium, then become highly coacervate to form chromosome at the stage of spermatid and at last decondense at the stage of spermatozoon.

4. Primary spermatocyte was derived from spermatogonium of light staining type and produced spermatozoon. Through two successively mature cell divisions.

5. It was difficult to distinguish oogonium from spermatogonium according to the shape and size of gonium under light microscope.

6. The results indicates that the spermatogenic process was like other teleosts, both included following stages spermatogonium , primary spermatocyte, secondary spermatocyte, spermatid and spermatozoon.

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7. Objective To study the mutability of ultra sodium pyrosulfite intake on ultrastructure changes and spermatogonium mice testis.

8. Objective To observe effect of selenium on the protein P16 expression in the testicle spermatogonium of rat borne with colon cancer induced by azoxymethane.

9. The results show that, there are typical Golgi apparatus in spermatogonium, they are located near the nuclear membrane, and the saccules are connected by connective tubules.

10. In order to study the general law on meiosis of Periplaneta Brunnea. Air-dried method was used to observe the chromosome of spermatogonium in different stages.