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原標(biāo)題：精彩国产3p难得叫声很大

　　首??(shou)先??(xian)要??(yao)識(shí)??(shi)別??(bie)“自??(zi)我??(wo)”與??(yu)“非??(fei)我??(wo)”?。??通?(tong)過(guò)??(guo)細(xì)??(xi)胞?(bao)表??(biao)面??(mian)的??(de)特??(te)殊??(shu)蛋??(dan)白??(bai)(如秘(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(lái)??(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(lèi)??(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)??！　?(ying)幼??(you)兒??(er)期??(qi)(0～3歲??(sui))??，新??(xin)生??(sheng)兒??(er)免??(mian)疫??(yi)系??(xi)統(tǒng)??(tong)像??(xiang)一??(yi)支?(zhi)未??(wei)經(jīng)?(jing)實(shí)?(shi)戰(zhàn)??(zhan)的??(de)“新??(xin)兵??(bing)部??(bu)隊(duì)??(dui)”??，先??(xian)天??(tian)性??(xing)免??(mian)疫??(yi)(如??(ru)中??(zhong)性??(xing)粒??(li)細(xì)??(xi)胞??(bao)、巨??(ju)噬??(shi)細(xì)??(xi)胞??(bao))活??(huo)性??(xing)高??(gao)??，但?(dan)皮??(pi)膚??(fu)、黏??(nian)膜??(mo)屏??(ping)障??(zhang)薄??(bo)弱??(ruo)??，易??(yi)受??(shou)病??(bing)毒??(du)(如??(ru)呼??(hu)吸??(xi)道??(dao)合??(he)胞?(bao)病??(bing)毒??(du)、輪??(lun)狀??(zhuang)病??(bing)毒??(du))侵?(qin)襲??(xi)?。??此??(ci)時(shí)??(shi)主??(zhu)要??(yao)依??(yi)賴(lài)??(lai)母??(mu)體??(ti)通?(tong)過(guò)??(guo)胎??(tai)盤(pán)??(pan)和??(he)母??(mu)乳??(ru)傳??(chuan)遞??(di)的??(de)抗??(kang)體?(ti)(如??(ru)IgG、IgA)提??(ti)供??(gong)保??(bao)護(hù)??(hu)?。。