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. 2009 Feb 25;101(5):2601–2619. doi: 10.1152/jn.90881.2008

FIG. 4.

FIG. 4.

Exocytosis due to step depolarizations to physiological membrane potentials using 10 mM EGTA. A: composite data for all terminals. Bars, from leftmost to rightmost, represent terminals depolarized for −35, −30, −28, and −25 mV. B: comparison of capacitance jump for terminals depolarized to −28 mV using P1 (leftmost bar), depolarized to −28 mV using P2 (middle bar), and depolarized to 0 mV for 15 ms (rightmost bar). The P2 and 15 ms to 0 mV protocols are significantly different (shown by stars; P < 0.05) from the P1 protocol. C: average charge for terminals loaded with 0.5 mM EGTA and step depolarized to −35, −30, −28, and −25 mV (from left to right, respectively). The number of terminals stimulated at each condition is: −35 mV (n = 4), −30 mV (n = 4), −28 mV (n = 8), and −25 mV (n = 11).