Singular localization of sodium channel β4 subunit in unmyelinated fibres and its role in the striatum

Voltage-gated Na+ channel β-subunits are concentrated in the nodes of Ranvier and axon initial segments of myelinated axons and have a variety of functions. Here the authors show, using genetically modified mice, that this subunit is present in unmyelinated fibres in the striatum and is required for generation of resurgent Na+ current in striatal neurons.