Transcription factor (PubMed:11959845, PubMed:28056346). Regulates neuronal subtype identity (PubMed:11959845, PubMed:28056346). Involved in motor neuron fate determination and maintenance, acting as a transcriptional repressor to counteract gene activation by transcription factor unc-3 in a subset of motor neurons (PubMed:28056346). Probably acts by binding to specific promoter elements (PubMed:28056346). Promotes differentiation of URA sensory neurons and prevents them from expressing male-specific CEM neuronal features (PubMed:11959845). Promotes differentiation of AVD and PVC interneurons and their glutamate receptor expression (PubMed:11959845). Present in IL2 and URA neurons, and in AVD and PVC interneurons. Present in muscles from head and pharynx (at protein level). Expressed in mid-late embryo, throughout larval development and in the adult (PubMed:11959845). Expressed in larvae in various motor neurons, including cholinergic DA, DB, VA, and VB, and also GABAergic DD and VD, but not AS or VC, nor in SAB or DA9 motor neurons (PubMed:28056346). By unc-86.