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	167,640	3,477	0	7,334	0	832	5	179,288
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 ligand browser.
Ligand statistics were last updated 2021-12-23.

Ligand coverage of GPCR Classes

Circle colors indicate a number of ligands:

< 100

< 500

< 1000

1000+