Table 1.

Composition of solutions used in this study

No.	Sodium chloride	Magnesium chloride	Potassium chloride	Sodium glutamate monohydrate	HEPES or MES	EGTA
I	130	0	0	0	3	0.2
II	30	100	0	0	3	0.2
III	0	0	130	0	3	0.2
IV	0	0	0	130	3	0.2

All values indicate the final concentration (mM) after adjustment of the pH level. For Solutions I, II, and III, pH was adjusted by hydrochloric acid or sodium hydroxide, whereas for Solution IV, pH was adjusted by l-glutamic acid or sodium hydroxide.