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A, recording of membrane current as in previous figures. Ado (100 μm) was applied as indicated. Pipette filling solution was supplemented with 10 μm AP5A at standard [ATP]i of 2 mm. B-D, difference I–V curves of Ado-activated (control) IK(ACh) (B), inhibited IK(ACh) (C) and current activated by intracellular AP5A (D). Letters correspond to those in A.
