Table 2.

Composition of the solutions used in the experiments.

Krebs	150 mM NaCl
	6 mM KCl
	1.5 mM CaCl2 × 2H2O
	1 mM MgCl × 6H2O
	10 mM glucose
	10 mM 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES)
Ca2+-Free Krebs	150 mM NaCl
	6 mM KCl
	1 mM MgCl × 6H2O
	10 mM glucose
	10 mM HEPES
	10 mM ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid (EGTA)