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In page G protein-coupled receptor:

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It is believed that a receptor molecule exists in a conformational equilibrium between active and inactive biophysical states.[2] The binding of ligands to the receptor may shift the equilibrium toward the active receptor states. Three types of ligands exist: Agonists are ligands that shift the equilibrium in favour of active states; inverse agonists are ligands that shift the equilibrium in favour of inactive states; and neutral antagonists are ligands that do not affect the equilibrium. It is not yet known how exactly the active and inactive states differ from each other.[citation needed]