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In page Transcription factor:

"

Transcription factors bind to either enhancer or promoter regions of DNA adjacent to the genes that they regulate based on recognizing specific DNA motifs. Depending on the transcription factor, the transcription of the adjacent gene is either up- or down-regulated. Transcription factors use a variety of mechanisms for the regulation of gene expression.[1] These mechanisms include:

  • stabilize or block the binding of RNA polymerase to DNA[citation needed]