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Excitatory responses of GPi neurons induced by orexin-A. A Orexin-A elicited inward currents in a GPi neuron in a concentration-dependent manner at a holding potential of −60 mV. B Group data of the two types of neuron (n = 5/group). C Orexin-A depolarized the membrane potential and increased the firing rate of a GPi neuron. D Peri-stimulus time histogram of the two types of neuron (n = 5/group).
