Lac Operon

The lac operon is a well-studied example of gene regulation in prokaryotes, particularly in *Escherichia coli*. It consists of three structural genes—lacZ, lacY, and lacA—that are involved in the metabolism of lactose. These genes are regulated by the presence or absence of lactose and glucose in the environment. The operon is controlled by a promoter, an operator, ______ ___ _______ _________ _____ _____ _______.
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