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Fig. 7. Three representative examples of the effects of {gamma}-amino-butyric acid (GABA) iontophoresis on electromotor neuron (EMN) output in the dorsal posterior (DP), precommand (PCN) and ventroposterior nuclei (VP). Each row corresponds to a single fish. In each case, iontophoretic currents consisted of +1 µA for 20 s, which is indicated by the horizontal bar beneath each column.