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　　首??(shou)先??(xian)要??(yao)識??(shi)別??(bie)“自??(zi)我??(wo)”與??(yu)“非??(fei)我??(wo)”??。??通??(tong)過??(guo)細(xì)??(xi)胞??(bao)表?(biao)面??(mian)的??(de)特??(te)殊??(shu)蛋??(dan)白??(bai)(如??(ru)MHC分?(fen)子??(zi))區(qū)??(qu)分??(fen)自??(zi)身??(shen)細(xì)??(xi)胞??(bao)和??(he)外??(wai)來??(lai)病??(bing)原?(yuan)體??(ti)??。一??(yi)旦??(dan)誤??(wu)判??(pan)??，可??(ke)能?(neng)攻??(gong)擊??(ji)自??(zi)身??(shen)組??(zu)織??(zhi)??，導(dǎo)??(dao)致?(zhi)類??(lei)風(fēng)??(feng)濕??(shi)關(guān)??(guan)節(jié)??(jie)炎??(yan)、1型??(xing)糖??(tang)尿??(niao)病??(bing)等??(deng)疾??(ji)病??(bing)???！　∶??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)如??(ru)何??(he)守??(shou)護(hù)?(hu)我??(wo)們??(men)的??(de)健??(jian)康??(kang)。