Involved in combinatorial activation of gene expression in pharyngeal muscle. Specifically binds a site necessary for activity of the B subelement of myo-2 enhancer. Regulates distal tip cell fate. First expressed prior to myogenic differentiation, expression continues throughout embryonic and larval development and is most abundant in embryos. It is present in decreasing amounts throughout development and a low level is found in the adults (PubMed:7925019). Expressed in distal tip cells (DTC) until L4 larval stage (PubMed:24346701). The homeobox domain is required for the induction of distal tip cell fate. RNAi-mediated knockdown in a bet-1 mutant background prevents the formation of extra distal tip cells (DTC) during gonad development. Belongs to the NK-2 homeobox family.