KCNC4 and spinal cord injury: Lastly, and already alluded to above (section “Spinal Cord Injury and Changes in Peripheral Neuron Excitability”) Kv3.4 current amplitude, inactivation, and channel membrane expression are reduced in the DRG following unilateral spinal cord contusion (Ritter et al., 2015a; Zemel et al., 2017).