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Proctolin elicits an inward current with an unusual voltage dependence. The peak proctolin response in this LP neuron was elicited at approximately −40 mV and decreased in amplitude for more positive (−20 mV) and more negative (−60 mV) membrane potentials. Proctolin was pressure-applied at 4 × 10−4m (400 msec) to the STG neuropil. This recording was made using TEVC in the presence of 10 μm PTX and 0.1 μm TTX.
