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Agonist

/ˈagənist/ Noun, pl. agonists 1. An agonist is a chemical that binds to some receptor of a cell and triggers a response by that cell. Agonists often mimic the action of a naturally occurring substance. (wikipedia.org) 2. (Pharmacology) A molecule that combines with a receptor on a cell to trigger physiological reaction. An example is an acetylcholine being the agonist that combines with the cholinergic receptor. (biology-online.org) 3. (Histology) A muscle that contracts while another muscle relaxes, e.g. when bending the elbow the biceps are the agonist....

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