Number of unique ligands per receptor class

Class (Family) A (Rhodopsin) B1 (Secretin) B2 (Adhesion) C (Glutamate) D1
(Ste2-like fungal pheromone)
F (Frizzled) T2 (Taste 2) Total
No. ligands 167,638 3,477 0 7,334 0 832 5 179,286
Average no. ligands/GPCR 572 232 0 333 0 76 0 358
No. GPCRs with ligand (%) 203 (69) 14 (93) 0 (0) 11 (50) 0 (0) 1 (9) 1 (4) 230 (46)
Specific sets of ligands can be downloaded from the biased ligand browser.
Biased ligand statistics were last updated 2021-12-23.


Ligand coverage of GPCR Classes


Receptor names:

Circle colors indicate a number of ligands:
< 100
< 500
< 1000
1000+