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目的分析信号转导子及转录激活因子4(signal transducer and activator of transcription4,STAT4)基因启动子区域单核苷酸多态(single nucleotide polymorphism,SNP)位点rsl6833431A〉G多态性与山东汉族人群支气管哮喘发生的相关性。方法采用聚合酶链式反应-限制性片断长度多态(polymerase chain reaction and restriction fragment length polymorphism,PC