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Single channel recordings. Single-channel activity in cell-attached patches from Pokkali (left hand panels) and IR20 (right hand panels) root protoplasts of (a) potassium inward rectifier; (b) potassium outward rectifier; (c) non-selective cation channel. Step potentials are indicated to the right of the recorded current traces. Closed levels are indicated by the arrows. Patch pipette contained 100 mM KCl.
