Classification of G protein-coupled receptors

Class I

Catecholamines, acetylcholine, serotonin

Gastrin/CCK, neuropeptide Y, substance P

Class II

Secretin, glucagon, vasoactive intestinal polypeptide, glucagon-like peptide 1

Class III

Glutamate-metabotrophic receptors, calcium receptors

Classification_of_G_protein.htm

CCK: cholecystokinin.

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