Table 1.

Composition of internal solutions^* (in mM)

	HEK cells	DRG neurons	Chromaffin cells
NaCl	10	—	—
KCl	145	150†	—
CsCl	—	—	153
MgCl2	1	1	1
Hepes	5	10	5
ATP-Mg	—	4	—
pH	7.2	7.2	7.2

^*For fluorescence calibration experiments, 1 mM fura-2 potassium salt was added to internal solutions. For calcium imaging experiments, 0.1 mM fura-2 salt was added to internal solutions.

^†For capacitance measurement of DRG neurons, 150 mM KCl was replaced with 153 mM CsCl to block K⁺ channels.