Probable transcription factor that is required for uterine and neuronal cell fate decisions (PubMed:9834196, PubMed:14668410, PubMed:23946438). Controls genes required for the specification and differentiation of O(2) and CO(2)-sensing neurons and for maintaining URX sensory neuronal cell fate (PubMed:23671427). Localized to nucleus during interphase. Expressed in body wall muscle and head and tail neurons (PubMed:9834196). Specifically expressed in O(2) and CO(2)-sensing neurons, including BAG and URX sensory neurons (PubMed:23671427). Expressed following fertilization and during embryogenesis in four neuronal cells (PubMed:23671427). Expressed in BAG, URX, AQR and PQR sensory neurons and cells in the head and tail in L1 larval stage and in the body wall muscle and vulval cells later in larval development (PubMed:23671427, PubMed:23946438). Expressed in cells of the pi uterine cell lineage from late L3 to mid L4 (PubMed:9834196). Hermaphrodites have an egg laying defective phenotype and a reduced brood size (PubMed:9834196). They display a protruding vulva phenotype and there is a failure of anchor cells to fuse to uterine seam cells (anchor cell-block) (PubMed:9834196). Animals also have defective vulval morphogenesis and gonad migration with increased pi cell divisions, which thus leads to an improper uterine-vulval connection (PubMed:9834196, PubMed:14668410). Defective response to CO(2) sensing (PubMed:23671427).