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| Modern Genetic Analysis Chapter 14. Regulation of Gene Transcription Regulation of the Lactose System Figure 14-3. A simplified lac operon model. The three genes Z, Y, and A are coordinately expressed. The product of the I gene, the repressor, blocks the expression of the Z, Y, and A genes by interacting with the operator (O). The inducer can inactivate the repressor, thereby preventing interaction with the operator. When this happens, the operon is fully expressed.

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