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Blocking potassium channels prevent the dopamine-induced reduction in input resistance. (a) Blockade of Na+ channels with 0.5 μM TTX does not prevent the reduction of peak or steady-state input resistance induced by 50 μM dopamine (*, P < .01). Conventions are as in Figure 8. (b) In contrast, coapplication of the K+ channel blocker TEA (30 mM) prevented the dopamine-induced reduction in input resistance.
