Rhodopsin family
Biogenic amine
Acetylcholine (muscarinic)
Adrenaline
Dopamine
Dopamine and ecdysteroid
Histamine
K04149 HRH1; histamine receptor H1 K04150 HRH2; histamine receptor H2 K04151 HRH3; histamine receptor H3 K04152 HRH4; histamine receptor H4
Octopamine and tryamine
Serotonin
Trace amine
Peptide
Chemokine
Base and nucleoside
Lipid
Vision
Others
Secretin receptor family
Adhesion receptor family
Metabotropic glutamate receptor family
Frizzled / Smoothened family