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  • the protein product of a regulator gene that prevents transcription of a gene at some other locus
    Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
  • A DNA-binding protein in prokaryotes that blocks gene transcription by binding to the operator.
  • A repressor is a protein that turns off the expression of one or more genes. The repressor protein works by binding to the gene's promoter region, preventing the production of messenger RNA (mRNA).

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