Class A
(Rhodopsin)
Class B1
(Secretin)
Class B2
(Adhesion)
Class C
(Glutamate)
Class D1
(Ste2-like fungal pheromone)
Class F
(Frizzled)
Class O1
(Olfactory/extra-nasal 1)
Class O2
(Olfactory/extra-nasal 2)
Class T2
(Taste 2)
Class V1 (Vomeronasal) Class U
(Unclassified)
Total
Receptors 221 15 14 18 1 8 4 8 5 0 0 294
Receptor - ligand complexes 1335 131 18 88 1 23 5 12 15 0 0 1628
Receptor – G protein complexes 204 15 12 10 1 5 4 8 5 0 0 264
Active-state receptors 209 15 13 13 1 7 4 8 5 0 0 275
Intermediate-state receptors 23 1 0 9 0 0 0 0 0 0 0 33
Inactive-state receptors 122 5 3 15 0 7 1 0 0 0 0 153
Class A
(Rhodopsin)
Class B1
(Secretin)
Class B2
(Adhesion)
Class C
(Glutamate)
Class D1
(Ste2-like fungal pheromone)
Class F
(Frizzled)
Class O1
(Olfactory/extra-nasal 1)
Class O2
(Olfactory/extra-nasal 2)
Class T2
(Taste 2)
Class V1 (Vomeronasal) Class U
(Unclassified)
Total
Receptors 2089 200 46 154 1 34 6 14 33 0 0 2577
Receptor - ligand complexes 2071 200 29 154 1 34 6 14 33 0 0 2542
Receptor – G protein complexes 1209 166 42 27 1 10 4 13 31 0 0 1503
Active-state receptors 1431 179 43 76 1 16 4 14 33 0 0 1797
Intermediate-state receptors 46 1 0 13 0 0 0 0 0 0 0 60
Inactive-state receptors 609 20 3 65 0 18 2 0 0 0 0 717
*Active state is defined as agonist-bound and opened intracellular TM bundle. Specific sets of structures can be downloaded from the Structures page. The latest released structure is from 2026-07-15.