免疫系统不能对自身组织产生免疫应答,而只能对非己的组织成分产生免疫应答。T细胞或B细胞表面只有一种特异的抗原受体,能与相对应的抗原反应,也就是说有多少种抗原就应该有多少种抗原受体。将其中自身抗原反应性克隆(带有同一抗原受体的细胞集团)排除或使其处于不应答状态,则 The immune system can not produce an immune response to its own tissues, but can only have an immune response to non-existing tissue components. There is only one specific antigen receptor on the surface of T cells or B cells, which can react with the corresponding antigen, that is, how many kinds of antigens should have the number of antigen receptors. When an autoantigen-reactive clone (a cell group with the same antigen receptor) is excluded or left unresponsive,