The external solution also contained 300 nM tetrodotoxin to block NaV channels. Pipette solutions contained (in mM): sodium acetate 10, CsCl 110, TEA-bromide 50, ATP-Na2 2, CaCl2 0.5, EGTA 10, HEPES 10, adjusted to pH 7.4 with 1 M CsOH. To eliminate any influence of differences in ...