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Potassium currents and dopamine (DA) checked in differentiated neurons. (A) Depolarizing pulses evoked a slow outward current. (B) Potassium currents were blocked when tetraethylammonium chloride (TEA) was added into the extracellular solution. (C) Current–voltage curves (I-V curves). (D) Concentrations of DA that is released by differentiated cells. *P < 0.05. **P < 0.01.
