Transcription factor that controls transcriptional expression of its target genes by binding to the E box (5'-CANNTG- 3'). Plays a role at early stages of development of specific neural lineages in most regions of the CNS; and of several lineages in the PNS. Acts synergistically with FOXN4 to specify the identity of V2b neurons rather than V2a from bipotential p2 progenitors during spinal cord neurogenesis; probably through DLL4-NOTCH signaling activation. Essential for the generation of olfactory and autonomic neurons (By similarity). {ECO:0000250}.