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. biased ligands	199,290	6,166	6	8,283	0	1,018	548
No. GPCRs with ligand	239	15	5	13	0	8	25

Specific sets of ligands can be downloaded from the ligand browser.

Ligand coverage of GPCR classes

Circle colors indicate a number of ligands:

< 100

< 500

< 1000

1000+