Involved in epithelial cilium movement involved in determination of left/right asymmetry; lung development; and protein localization to cilium. Acts upstream of or within axoneme assembly and determination of left/right symmetry. Located in cilium and cytoplasm. Is active in motile cilium. Is expressed in several structures, including central nervous system; node; olfactory epithelium; and respiratory system. Human ortholog(s) of this gene implicated in primary ciliary dyskinesia 15. Orthologous to human CCDC40 (coiled-coil domain containing 40). [provided by Alliance of Genome Resources, Apr 2022]