TABLE 2.

Steady-state electrical properties of islets and isolated β-cells

Groups		Resting membrane potential (mV)	Plateau potential (mV)	Action potential peak (mV)	Action potential amplitude (mV)	Frequency (min−1)	δ-peak
Islets N = 9		−58.6 ± 3.3*†	−43.1 ± 2.6	−19.1 ± 3.1	33.7 ± 3.5*‡	0.54 ± 0.11*‡	N/A
Isolated β-cells	Class I N = 10	−46.1 ± 2.5	N/A	−23.6 ± 4.3	21.3 ± 2.2	94.0 ± 12.9	66.7 ± 10.6
	Class II N = 23	−44.0 ± 1.0	−36.0 ± 1.7	−19.0 ± 1.6	17.8 ± 1.0	35.8 ± 6.2	50.1 ± 9.9
	Class III N = 3	−45.3 ± 7.3	−32.0 ± 7.57	−22.0 ± 4.6	6.7 ± 1.3	12.3 ± 2.8	−28.0 ± 14.5

Mean ± SE.

^*P < 0.05 versus Class I.

^†P < 0.05 versus Class II.

^‡P < 0.05 versus Class III.