defined:

The part of a gene that contains the information to turn the gene on or off. The process of transcription is initiated at the promoter.

explained:

Listen to a detailed explanation. (Requires the free RealPlayer download)

Dr. Richard Morgan, formerly of the National Human Genome Research Institute's Clinical Gene Therapy Branch, defines promoter.

related
terms:

gene, deoxyribonucleic acid (DNA), protein

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