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The tryptophan operon is a repressible operon found in *Escherichia coli* and other bacteria, responsible for regulating the biosynthesis of the amino acid tryptophan. It consists of five structural genes, *trpE, trpD, trpC, trpB,* and *trpA*, which encode enzymes required for the stepwise conversion of chorismic acid into tryptophan. These structural genes are controlled by a single promoter, an operator region, and _________ ___ _____ ______ _________ _______ ___ _______.
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