Plays a role in regulating gene expression in dopaminergic neurons, acting redundantly with homeobox protein ceh-20 in head neurons (PubMed:23788625). May activate dopamine pathway genes in concert with ETS domain-containing protein ast-1, and homeobox proteins ceh-43 and ceh-20 (PubMed:23788625). Expressed in head dopaminergic neurons. Expressed in embryos. Worms show no phenotype but, when also lacking ceh-20, incompletely penetrant embryonic lethality is observed. Belongs to the TALE/PBX homeobox family.