Sperm donation should, however, be handled very carefully, said Qiao Jie, head of the reproduction center of Peking University Third Hospital, China's biggest fertility clinic. 然而,中国最大的生殖门诊-北京大学第三医院生殖中心负责人乔杰则说,精子捐献须谨慎处理。
In the process of sperm cell development, the blepharoplast became loose, and the centrioles originated from the subunits separated from each other and dispersed towards the surface, with the amorphous material in the center. 随着精细胞的发育,生毛体结构变得松散,亚单位分化形成的中心粒彼此分开扩散到外围,中心为无定形物质。