Mediates the voltage-dependent sodium ion permeability of excitable membranes. Plays a role in processing of olfactory information during the olfactory avoidance response. In embryonic and larval stages, expression is limited to very few non-neuronal cells in either the CNS or PNS. In pupal and adult stages, expressed in cell bodies of the fly central nervous system, including optic lobes, central brain, subesophageal ganglion, thoracico-abdominal ganglion, major olfactory organs, the third antennal segment and the maxillary palps. The sequence contains 4 internal repeats, each with 5 hydrophobic segments (S1, S2, S3, S5, S6) and one positively charged segment (S4). Segments S4 are probably the voltage-sensors and are characterized by a series of positively charged amino acids at every third position. Partially edited. Target of Adar. Belongs to the sodium channel (TC 1.A.1.10) family. NaCP60E subfamily. Intron retention.