Probable transcription factor (PubMed:10882127, PubMed:12954713). May regulate some genes of ciliated sensory neurons (PubMed:10882127, PubMed:12954713). May activate the expression of the shared components of sensory cilia, but not the cell-type-specific expression (PubMed:10882127, PubMed:12954713). Together with transcription factor atf-7, involved in regulation of the serotonergic response of ADF neurons to pathogenic food (PubMed:23505381). Involved in male mating behavior; may play a role in functional specialization of PKD ciliated sensory neurons. Ciliated sensory neurons. Expressed in the male tail HOB and RnB neurons but not in male-specific CEM head neurons or other ciliated neurons. Expressed in the male-specific ciliated sensory neurons, including the two hook neurons, and the 36 ray neurons at the L4 larval stage. Belongs to the RFX family.