免疫系统象所有的器官和组织一样、存在程序性细胞死亡(Programmed Celkl Death,PCD),并且是细胞生理性死亡的主要形式.多种因素可通过细胞内信号传导的平衡与不平衡,启动或抑制程序性细胞死亡过程,产生特征性的形态学和生化改变.这种活化自身消除程序的发生,在T细胞库中特别明显,调节着机体内细胞群的合适比例. Like all organs and tissues, the immune system has Programmed Celkl Death (PCD) and is a major form of cell-mediated physiological death Many factors can be triggered by the balance and imbalance of intracellular signaling or Inhibits the process of programmed cell death resulting in characteristic morphological and biochemical changes that are particularly evident in the T cell pool and regulate the proper proportion of cell populations in the body.