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Figure 4


Fig. 4. Brain application of 50 µmol l–1 5-HT hyperpolarized the swim-triggering neuron Tr1. 5-HT caused a gradual change of the resting membrane potential of Tr1, resulting in a 6 mV hyperpolarization after approximately 3 min of the application. At this hyperpolarized membrane potential, Tr1 ceased firing action potentials.