[名词解释] Cdc 2 protein (Cdc2蛋白)

check point (关卡) restriction point（限制点） S phase-promoting factor,SPF (S期促进因子) Cdc34 protein（Cdc34 蛋白） cyclin-dependent protein kinases, Cdks (周期蛋白依赖性蛋白激酶) Cdc 2 protein (Cdc2蛋白)