Probable component of the nca-1 sodium channel complex, a cation channel that regulates neuronal activity by transmitting depolarization signals to synapses. Regulates the transition from slow to rapid forms of locomotion. Required for localization of nca-1 along axons and in non-synaptic regions. Contributes to endocytosis defects in synaptojanin mutants. Involved in the control of anasthetic response to halothane. Expressed in the nervous system. Expressed in both acetylcholine and GABA motor neurons. Fainters phenotype, characterized by defects in locomotion, vesicle depletion, and electrophysiological defects in synaptojanin mutants. Belongs to the unc-80 family.