脊椎动物尽管具有对自体及非自体成份作出免疫学反应所必需的全部遗传信息,并能通过自体识别过程诱发和调节其免疫装置,但一般而言,正常免疫系统对自体成份具有表型上的耐受性。耐受性有中枢和周围两型。中枢型免疫细胞缺如或无反应,故抗原攻 Vertebrates, in spite of all the genetic information necessary for making immunological responses to both autologous and non-self-components, can induce and regulate their immune devices through an autologous identification process. In general, however, the normal immune system has phenotypic Tolerance. Tolerance has both central and peripheral types. Central immune cells lack or no response, so the antigen attack