There are many factors that regulate the proliferation and differentiation of cells. The major factors include cyclin, cyclin dependent kinase (cdk) and cyclin dependent kinase inhibitor (CDKI).

• 调节细胞增殖和分化的因素有许多种，其中主要有细胞周期蛋白(cyclin)、细胞周期蛋白依赖性激酶(cyclin dependent kinase，cdk)和细胞周期蛋白依赖性激酶抑制因子(cyclin dependent kinase inhibitor,CDKI)。