Axoneme-binding protein that plays a role in the regulation of ciliary motility and cilium length. Present all along the flagellum, with a marked signal at the base of the flagellum. Detected in ependyma, trachea, lung, testis, and oviduct, but not in whole brain, liver, kidney, and spleen (PubMed:30158508). Localizes on the epithelial cilia and sperm flagella (at protein level) (PubMed:30158508). The conserved TPR domains are dispensable for ciliary targeting. The N-terminal half is important for cilary localization and/or binding to the axoneme. Belongs to the CFAP70 family.