TABLE 1.

Ca²⁺ buffering in the internal solutions used.

Ca2+ Buffer	[buffer]total (mM)	[Ca2+]total (µM)	[Ca2+]free (nM)	Figures
BAPTA	0.1	9	15	1, 2, 5, 6
BAPTA	0.25	29	20	3, 4, 7, 8, 9
BAPTA	2	244	21	1, 2, 5, 8
EGTA	0.25	9	19	3, 4
dibromoBAPTA	2	1789	10300	6