Receptor	M1	M2	M3	M4	M5
PDB	5CXV	3UON, 4MQS, 4MQT	4DAJ, 4U14, 4U15, 4U16	5DSG	---
Organism	H.sapiens	H.sapiens	R.norvegicus	H.sapiens
Insert part/ proper part/ total	160/291/451	160/278/438	118/273/391	185/207/392
Identity with M1 (%)	100	52	58.6	53.4	60.8
Identity with M2 (%)	52	100	48.4	62.4	48.9
Identity with M3 (%)	58.6	48.4	100	47.6	52.8
Identity with M4 (%)	53.4	62.4	47.6	100	49.6
Identity with M5 (%)	60.8	48.9	52.8	49.6	100
Ligand with crystal	Tiotropium	Iperoxo; (3R)-1-azabicyclo[2.2.2]oct-3-yl hydroxy(diphenyl)acetate	Tiotropium; N-methyl scopolamine	Tiotropium