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酵母双杂交系统是将待研究的两种蛋白质分别克隆（融合）到酵母表达质粒的转录激活因子（如GAL4等）的DNA结合结构域（DNA-BD）和转录激活域（AD）上，构建成融合表达载体，从表达产物分析两种蛋白质相互作用的系统。