Transcription factor (By similarity). Plays a role in embryogenesis and later development, perhaps acting redundantly with forkhead protein pes-1 (PubMed:11044397). RNAi-mediated knockdown by injection into adults causes almost half of their progeny to terminally arrest at the larval L1 stage and the rest developed into fertile adults (PubMed:11044397). Simultaneous knockdown of forkhead gene pes-1 causes 8% embryonic lethality and 80% of progeny to arrest at larval L1 stage (PubMed:11044397).