| n. | 1. | any agency bringing about activation; (Biol.) a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription. |
| Noun | 1. | activator - (biology) any agency bringing about activation; 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 - a substance that retards or stops an activity |
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