Agonist

An agonist is a chemical that activates a receptor to produce a biological response. Receptors are cellular proteins whose activation causes the cell to modify what it is currently doing. In contrast, an antagonist blocks the action of the agonist, while an inverse agonist causes an action opposite to that of the agonist.

For other uses of "Agonist" or "Agonism", see Agonist (disambiguation). For a primary fictional character in a work, see Protagonist and Antagonist.
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