Transcription factor (PubMed:16777607). Represses gene expression, probably via binding to DNA consensus sequence 5'-[AT][CT]TTCC[AC][AG]-3' in promoter regions (PubMed:16777607). May play a role in pharynx morphogenesis (PubMed:16777607). Expressed in pharyngeal epithelium/arcade, which connects the pharynx to the mouth. RNAi-mediated knockdown causes an increase in fat-5 gene expression in the pharynx (PubMed:16777607). Pharynx unattached (Pun) phenotype (PubMed:16777607).