Table 1.

Voltage-dependent parameters for Q–V relationships of WT and mutant M2R

	V1/2 (mV)	SEM	z	SEM	n
WT	−67.0	3.0	0.55	0.02	10
D103A	−133.9	4.1	0.50	0.01	5
W99A	+15	1	0.8	0.02	8
Y104A	−119.8	1.4	0.54	0.02	4
S107A	−66.1	8.2	0.49	0.02	4
Y403	−99.2	2.9	0.57	0.02	5
D120N–R121N	−100.0	4.1	0.52	0.04	3