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In metabolism, a control mechanism by which a protein molecule, called a repressor, prevents the synthesis of an enzyme by binding to (and thus hindering the action of) the DNA that controls the enzyme's synthesis. Though the process has been studied mainly in microorganisms, it is believed to occur in a similar way in higher organisms. See alsoinhibition.
This entry comes from Encyclopædia Britannica Concise. For the full entry on repression, visit Britannica.com.