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【简答题】
Trp是一种调节分子，被视为___________。它与一种蛋白质结合形成___________。乳糖操纵子和Trp操纵子是两个___________调控的例子。cAMP—CRP蛋白通过___________调控起作用。Trp操纵子受另一种系统___________的调控，它涉及第一个结构基因被转录前的转录___________。
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