Do sympathetic preganglionic neurones have a recurrent inhibitory mechanism?

@article{Lebedev2004DoSP,
  title={Do sympathetic preganglionic neurones have a recurrent inhibitory mechanism?},
  author={V. P. Lebedev and V. I. Petrov and Valentin A. Skobelev},
  journal={Pfl{\"u}gers Archiv},
  year={2004},
  volume={383},
  pages={91-97}
}
In anaesthetized and immobilized cats 32.5% of the intermediolateral sympathetic preganglionic neurones (B2-SPN) in T3, T8–9 and L2 spinal segments can be re-excited antidromically by repeated stimuli only at very long interstimulus intervals (16 ms and more) considerably exceeding the refractoriness of the somata and axons of these neurones. This was observed in the absence of any association with subnormality or other peculiarities B2-SPN axons. In this group of B2-SPNs with prolonged time… 
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