Table 1.

Extracellular and intracellular solutions used for the electrophysiological recordings

	Composition (mm) of extracellular solutions, pH adjusted to 7.4 with NaOH
	NaCl	NaGluc	NaSCN	KCl	KGluc	CaCl₂	MgCl₂	HEPES	TEA-Cl	Sucrose	Glucose
Ext_Cl-131	102.7	20		2		2	1.2	10	20	15	14
Ext_Cl-10		139.1			2	2	1.2	10	3.6	15	14
Ext_SCN		9	132.5		2	2	1.2	10		15	14

	Composition (mm) of intracellular solutions, pH adjusted to 7.2 with KOH
	KSCN	KCl	KGluc	EGTA	CaCl₂	MgCl₂	HEPES	TEA-Cl	MgATP	Sucrose	V_j (mV)
Int_Cl-131		107.1		11	1	1	10	20	2	14	−2.2
Int_Cl-10			121.1	11	1	1	10	6	2	14	−11.4
Int_Cl-15			111.1	11	1	1	10	11	2	35	−12.8
Int_Cl-4			121.1	11	1	1	10		2	52	−14.6
Int_SCN	132.5			11	1	1	10		2	14

The junction potential (V_j) was calculated for the different intracellular solutions with reference to Ext_Cl-131 using Clampex 8.1 and a temperature of 21°C. Gluc, Gluconate; Ext, extracellular; Int, intracellular.