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 celldivisioncycle.
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。
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CellCycle Progression through the celldivisioncycle and transitions between various phases are regulated by using CDC25 phosphatases to activate specific cyclin-dependent kinase(CDK) complexes.
In addition, both monomeric and dimeric CPAP are required for accurate celldivision, suggesting that the temporal dynamics of CPAP homodimerization is tightly regulated during the cellcycle.