activator

Pronunciation:			'aktu`veytur
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WordNet Dictionary
	Definition:		[n]  any agency bringing about activation; (biology) a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription
	Antonyms:		inhibitor
	See Also:		accelerator, activating agent, catalyst, matter, sensitiser, sensitizer, substance
Biology Dictionary
	Definition:		In biochemistry: A DNA-binding protein that regulates one or more genes by increasing the rate of transcription. A metabolite that positively modulates an allosteric enzyme.