A specific type of CDK is called the mitosis promoting factor or MPF and what that does is when it builds up enough of these cyclin dependent kinases, they're actually going to work on the cell.

一种特定类型的周蛋白依赖性激酶被有丝分裂促进因子或MPF， 它的作用是当这些周蛋白依赖性激酶积累到足够多时，它们实作用于细胞。

So it may be better to come from here and how we use cyclin, an example of that would be mitosis promoting factor (MPF) to control the cell cycle in where it is and where it's headed next.

因此，从这里出发， 我们可以更好地理解周蛋白的运用，比如以有丝分裂促进因子（MPF）例， 它如何调控细胞周， 决定细胞当前所处阶段及下一步走向。