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大肠杆菌色氨酸操纵子阻遏蛋白必须先与辅阻遏物_______相结合，结合于操纵基因。在trp操纵基因与结构基因之间有一段能被转录的_______，可编码含有2个_______残基的14肽。色氨酸充裕时，_______翻译迅速，转录中断；色氨酸不足时，_______翻译迟滞，结构基因的转录得以继续进行，称为_______调节。
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