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Illustration of a receptor on the surface of a cell with the drug. An agonist drug (key) binds to ...

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Description
Illustration of a receptor on the surface of a cell with the drug. An agonist drug (key) binds to and unlocks or activates a receptor (lock). An antagonist drug (key) binds to and blocks a receptor (lock), but does not activate it. This antagonist drug prevents the agonist drug from unlocking the receptor.
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