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Fig. 9. The opener inhibitor (OI) can completely suppress the synaptic response to
the opener excitor (OE). Three recordings are shown from the same muscle
fiber; the top two show the result of stimulating OI 18.4 ms and 46.8 ms,
respectively, before stimulation of OE. The bottom trace shows the control
response to OE stimulation. Scale bar, 1 mV, 200 ms.