Orphan nuclear receptor that binds DNA containing an extended core motif half-site sequence 5'-ANGTCA-3' (PubMed:10648229, PubMed:18179707). Required for locomotion, neuron axon pathfinding, and regulation of expression of some peptide neurotransmitter precursors and of NMDA glutamate receptor genes (PubMed:10648229, PubMed:16183052, PubMed:9216999, PubMed:22690911). Involved in specifying interneuron identity, in concert with paired-like homeodomain unc-42 (PubMed:16183052). Plays a role in recognition of the PVPR and PVQL axons by the AVKR and HSNL growth cones (PubMed:9216999). Expressed in embryonic and postembryonic neurons, including AVKR and AVKL interneurons (at protein level) (PubMed:10648229, PubMed:16183052). Expressed in the AVA, AVB, and AVE bilateral interneuron pairs, the RIC bilaterally-paired interneurons, SIBD and either SIBV or SMBV neuron pairs, M4 motorneuron, and the unpaired DVA interneuron (at protein level) (PubMed:16183052). Expressed dynamically in two non-neuronal cell types during larval development, paired distal tip cells (DTCs) of the hermaphrodite somatic gonad of L2 through L4 stage larvae and two pairs of vulval cells in L4 hermaphrodite larvae (at protein level) (PubMed:16183052). Expressed in the pairs of CEPD and URX sensory neurons, three pharyngeal neurons (M1, MI and probably M5), two pairs of ring interneurons (including the RIC pair), five neurons in the retrovesicular ganglion (including SABD and the pair of SABV neurons), a single neuron in the preanal ganglion and a single neuron in the dorsorectal ganglion of the tail (PubMed:10648229). Not expressed in either of the HSN or PVQ neurons, or in the PVPR neuron at any stage of development (PubMed:10648229). Putative ligand binding domain (NR LBD) may be dispensable for import into nuclei and in the development of neurons that control movement. Belongs to the nuclear hormone receptor family.