Representative action of NOR3 on inhibitory synaptic transmission in the SG of the spinal dorsal horn in vivo . A. Spontaneous IPSCs before and 8 min after (left trace) application of NOR3. Two lower consecutive traces of spontaneous IPSCs as shown in an expanded scale in time. B. Time course of the current charge amplitude of spontaneous IPSCs and relative series resistance of the recording under the action of NOR3. Data in A and B were obtained from the same neuron. C. Summary showing inhibitory action of NOR3 on inhibitory synaptic response. *P < 0.05 vs. control.