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Current–voltage relation. Single-channel records from a patch held at various membrane potentials are shown (A1–A3). (A1) No channel opened before NT application. (A2) Channel activity was induced by NT (10 nM). (A3) Segments of A2 on an expanded time base. The current through the NT-induced channels reversed from inward at −67 mV to outward at 33 mV. The current-voltage relation for the patch in A was plotted in B. Cs+-containing external and internal solutions were used.
