Start point (yeast)

白依赖性激酶调控。G1/S周期蛋白会使CLN3（英语：CLN3）-Cdk1（英语：Cdk1）活化Cln 1/2或酵母的起始点（英语：Start point (yeast)）Clb5/6以开始S期。该过程包含两个正反馈循环途径以使细胞快速单向进入S期。这种冗余途径并不常见，这会调整循环的输出并导致更快的基因水平进化。

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