MAIN OUTCOME MEASURES: the morphological changes of cryptorchidism, and the sorting results of spermatogonial stem cells.
主要观察指标：隐睾的形态学变化，精原干细胞分选结果。
Methods:Culture CHO cells in serum-free media and then compare the maintainance time, morphological changes and hemagglutination titers of the cells in culture supernatant.
方法：应用无血清培养基采用小方瓶培养CHO细胞，观察细胞维持时间、培养过程的形态变化。
Objective To study the morphological changes of the Schwann cells within the prede-generated nerve.
目的：了解华勒变性过程中雪旺细胞的形态学变化。
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