Also called a "lac I operon". A gene which is a part of the lac operon. It codes for a repressor protein, which prevents the transcription of genes that code for the enzymes that bring lactose into the bacterial cell and use it as a carbon source. The repressor protein prevents the unnecessary production of these enzymes when no lactose is present.

From the BioTech Dictionary at For further information see the BioTech homenode.

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