异种细胞的

Studies of molecular genetics have demonstrated that retinoblastoma susceptibility gene is closely related to the development of retinoblastoma and the theory of Rb gene mutation or inactivation has been putatively proven to be the molecular mechanism of RB formation.

本研究以我国培养建立的一株RB细胞系〓及裸鼠为实验材料和对象，在对〓细胞抑癌基因（Rb基因、p53基因）表达状况进行检测和鉴定的基础上，通过建立裸鼠玻璃体腔RB常位异种移植模型，构建Rb基因的逆转录病毒表达载体，以脂质体介导的Rb基因转移方式，进行RB体内基因治疗的实验研究，观察Rb基因在体内对RB的治疗作用及影响因素，并探讨其作用机制。

Methods: The hEGcs from the gonadal ridges and dorsal mesenteries of human embryos aged 5-10 weeks were cultured with or without cytokine in culture medium to observe their growth and the effects of different cell culture systems were compared.

目的：优化人胚胎生殖细胞的体外培养体系，并将生长状态良好的传代的人EG细胞移植用于大鼠心肌梗死模型的治疗，探讨人胚胎生殖细胞进行异种移植对大鼠心肌梗死的治疗机制。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。