Methods: The sub-acutely aging rats were made by injecting D-gal into abdominal cavity continually, then the ultrastructural changes of testis were observed under transmission electron microscope.

• 方法:D半乳糖连续腹腔注射制作亚急性衰老的大鼠模型,透射电镜下观察睾丸超微结构的变化。