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promoter

noun

1. (chemistry) a substance that is capable of increasing the activity of a catalyst to increase the rate of reaction

2. (chemistry) a chemical that is supposed to promote carcinogenicity or mutagenicity

3. (genetics) a site in a DNA molecule at which RNA polymerase and transcription factors bind to initiate transcription of mRNA.

The site is actually specific DNA sequences that are recognized by transcription factors, which recruit RNA polymerase at the site.