Probable transcription factor that regulates the expression of dopamine receptors dop-1, dop-2 and dop-3 and thus dopamine-dependent behaviors (PubMed:18508862, PubMed:21688290). May act redundantly with hlh-31 and hlh-32 to regulate ventral CEPsh glia functions (PubMed:18508862). May play a role in chemotactic responses in larvae (PubMed:16014321, PubMed:21688290). Expressed in neuronal tissues of the head, including sheath cells of the cephalic sensilla (CEPsh) glia. Expressed in embryos and during larval development (PubMed:16014321). Expressed strongly in cephalic sheath (CEPsh) glia at all developmental stages and in some motoneurons of the ventral cord in larvae (PubMed:18508862). Expression in ventral CEPsh glia is normal in knockout, but significantly reduced on a vab-3(ns157) mutant background (PubMed:18508862). RNAi-mediated knockdown causes egg-laying defects (PubMed:16014321).