二、蜘胞周期各肘相的动态及特点晴 (一)G期一合成前期(Gap1): ·l、RNA和Protein大量合成 2、限制点(restriction piont,R点) Resting Spindle Assembly Checkpoint state Check for: Chromosome attachment G2 Checkpoint to spindle 测 Check for: ·Cell size ·DNA replication G2 G1 Checkpoint G1 Check for: ·Cell size ·Nutrients S ·Growth factors (DNA synthesis) ·DNA damage 湿 Resting state(GO)二、细胞周期各时相的动态及特点 （一）G1期—合成前期（Gap 1）： ▪ 1、RNA和Protein大量合成 ▪ 2、限制点（restriction piont，R点）