The lac operon. In the absence of lactose, the repressor protein encoded by the I gene binds to the lac operator and prevents transcription. Binding of allolactose to the repressor causes it to leave the operator. This enables RNA polymerase to transcribe the three genes of the operon.n the absence of lactose, the repressor protein encoded by the I gene binds to the lac operator and prevents transcription. Binding of allolactose to the repressor causes it to leave the operator.
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Developed with secure data store technology to increase security of postal customer data and protect the privacy of. this information, the NCOALink Product enables mailers to process mailing lists and update lists with new addresses prior to mailing. The NCOALink Product can be integrated into mailersâ in-house computer systems to provide services or use internally. The use of the NCOALink Product is only available through licenses from the USPS.