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细胞周期Ｇ_２期延迟与调控细胞周期的特定蛋白──细胞周期素（Ｃｙｃｌｉｎ）有关，辐射作用后，细胞周期素的转录、表达发生改变，与细胞周期素结合的ｐ３４~（ｃｄｃ２）磷酸化和脱磷酸化状态也发生变化，从而导致细胞在Ｇ_２期滞留。
The cell cycle G 2 phase delay is related to the regulation of the cell cycle specific protein ── Cyclin. After radiation, the transcription and expression of cyclin are changed. The phosphorylation of cyclin-binding p34 ~ (cdc2) The status of dephosphorylation also changed, which resulted in the cells staying in G2 phase.