The initiation of DNA replication in mammalian cells is a highly coordinated process that ensures duplication of the genome only once per cell divisioncycle.
哺乳动物细胞的DNA复制启动是一个高度协调的过程，从而保证了每次细胞分裂中基因组只复制一次。
2
Wilmut said there were so many failures because it was difficult to ensure that the empty oocyst and the donor cell were at the same stage of the cell divisioncycle.
威尔·马特说之所以有这么多的试验失败，是因为很难保证空卵囊和供体细胞能处在细胞分裂周期的同一阶段。
3
Cell Cycle Progression through the cell divisioncycle and transitions between various phases are regulated by using CDC25 phosphatases to activate specific cyclin-dependent kinase(CDK) complexes.