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Sensitive repressors: The conformational change that occurs in the lac repressor protein when it binds to an inducer molecule has been used to develop a biosensor that permits the detection of the corresponding operator sequence or specific inducer molecules. A capacitive signal transducer was used to translate the conformational change of the lac repressor protein, covalently immobilized on a gold electrode (see schematic representation, A=bound inducer molecule or DNA), into a measurable signal.

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