Transcriptional repressor (By similarity). Involved in pharyngeal development and required for the formation of the pharyngeal isthmus (PubMed:15282157, PubMed:16806153). Plays a role in modulating cytoskeleton in the muscle cells of the isthmus (PubMed:16806153). Regulates expression of the acetylcholinesterase genes ace-1 and ace-2 (PubMed:16806153). May regulate its own expression (PubMed:15282157). Earliest expression in 4-8 cells of the pharyngeal primordium at around 280-300 min of embryonic development (PubMed:15282157). Expressed just before the comma stage (approximately 350 min) in two groups of pharyngeal primordium cells, persisting until the 3-fold stage (PubMed:15282157). At the 3-fold stage, expressed in several cells of the tail; expression continues in larvae and adults in several cells of the head, including at least two amphid neurons, intestinal cells, three rectal gland cells and 1-2 other unidentified rectal cells (PubMed:15282157).