Key transcription factor required for motile ciliogenesis. Activates genes essential for motile cilia formation and function. Expressed diffusely through much of gastrula and neurula stage embryos. At stage 23 (late neurula), limited to the otic vesicle. By stage 28 (tailbud), also expressed transiently in the presumptive nephrostomes of the pronephros. At stage 35 (early tadpole), expressed broadly in the head and strongly expressed in the developing gill structures. Belongs to the FOXJ1 family.