TABLE I.

Comparing G-V Parameters

[Ca2+]	α			α+β4
	V1/2	Q	N	V1/2	Q	N
μM	mV	e0		mV	e0
0.0005	177.6 ± 4.0	1.29 ± 0.06	12	269.1 ± 11.9	0.66 ± 0.04	17
0.3	128.7 ± 1.9	1.58 ± 0.04	20	181.8 ± 17.7	0.85 ± 0.09	10
1.7	80.9 ± 1.6	1.76 ± 0.05	24	97.0 ± 2.5	1.36 ± 0.05	14
7	33.1 ± 1.7	1.68 ± 0.06	13	52.8 ± 2.6	1.57 ± 0.06	24
18.5	−0.6 ± 1.5	1.86 ± 0.03	44	−2.0 ± 1.6	1.62 ± 0.04	26
60	−10.6 ± 3.1	1.76 ± 0.07	8	−36.5 ± 2.4	1.73 ± 0.06	17
100	−21.0 ± 1.8	1.91 ± 0.05	30	−38.9 ± 2.4	1.67 ± 0.06	26
300	−29.6 ± 3.4	2.09 ± 0.16	14	−40.4 ± 3.2	1.77 ± 0.13	13
1000	−43.7 ± 2.1	2.13 ± 0.17	12	−57.4 ± 3.6	1.62 ± 0.15	12

The values shown are Boltzmann-fit parameters. They indicate mean ± SEM.