Transcriptional activator. Interacts with promoter regions for tbx-8.9, tbx-9, elt-1, hnd-1, scrt-1, and vab-7 genes. Binds the sequence ATTTATGAC. Binds to the enhancer region of the hlh-1 gene promoter during embryonic body wall muscle development. Activates the gene for mab-5 in embryo development. Necessary for vab-7 expression in C blastomeres in the posterior of embryos. Required for posterior V6 neuroectoblast cell fate specification during postembryonic neurogenesis (patterning) which generates the characteristic ray lineage during male tail development. Binds to ced-3 promoter and activated expression which is crucial for tail-spike cell death. Has a role in E cell specification in endoderm development and body wall muscle development (By similarity). Interacts with tir-1 and let-756. Localized to condensed chromosomes. Belongs to the Caudal homeobox family.