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repressor

repressor (re-pres´er)

The product of a regulator or r. gene.
active r. a r. that combines directly with an operator gene to repress the operator and its structural genes, thus repressing protein synthesis; active r. may be repressed by an inducer, with resulting protein synthesis; a homeostatic mechanism for regulation of inducible enzyme systems.
inactive r. a r. that cannot combine with an operator gene until it has combined with a corepressor (usually a product of a protein pathway); after activation, the r. arrests production of the proteins controlled by the operator gene; a homeostatic mechanism for regulation of repressible enzyme systems.aporepressor;

 

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