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哺乳动物的细胞周期是由细胞增殖因子及其受体共同个导的信息传递系统引发的。在这种信息传递系．统的调节下调控并转录具有转录功能的遗传基因，细胞周期才能正常进行。细胞周期的各个不同时期对细胞增殖因子的依赖性各不相同，在整个G。／GI期这种依购性最强，一旦进入S期就
The mammalian cell cycle is triggered by a message delivery system that is commonly elicited by cell proliferation factors and their receptors. In this kind of information transmission system. Under the regulation of regulation, genes with transcriptional functions are regulated and transcribed, and the cell cycle can proceed normally. The different phases of the cell cycle depend on the cell proliferation factor differently throughout the entire G. This is the strongest purchase in the /GI period. Once it enters the S phase,