Transcription factor (By similarity). Plays a role in embryogenesis and later development, perhaps acting redundantly with forkhead protein pes-1 (PubMed:11044397). Expressed in the 4 descendants of the D blastomere in embryos at about the 185 cells stage and in many other unidentified cells located more anteriorly. RNAi-mediated knockdown by injection into adults causes slow and spatially restricted movement of about 30% of their L1 larval progeny, which nonetheless grow normally and do not display any obvious phenotype as late larvae or adults (PubMed:11044397). However, simultaneous knockdown of forkhead gene pes-1 causes 12% of eggs produced by hermaphrodites to arrest development at late stages of embryogenesis and 81% arrest after hatching as L1 stage larvae (PubMed:11044397).