This is possibly related to the testis of adult SOD eradicates constantly the injury to of sperms by free redical of superoxide.

• 睾丸SOD活性带变化提示，成年鼠睾丸的SOD带活性强于幼年鼠的活性，这与 成年鼠睾丸的SOD不断地清除超氧化物自由基对精子发生过程的损伤有关。