Probable transcription factor. At neurula stage, expressed in the notochord but not in the neural floor plate. During tailbud stages, expressed in the neural floor plate. At stage 35, expressed in the rhombencephalon, mesencephalon, pharyngeal pouches, foregut and pronephros. At stage 44, expressed in a region of the gut on the right hand side of the embryo. Expressed in the adult lung and liver. Expressed zygotically. Expression begins in the blastula stage. Levels increase throughout gastrulation before decreasing at the tadpole stage.