Acts as a regulator of cilium basal body docking and positioning in mono- and multiciliated cells. Localizes to the apical cell membrane, the basal body and the primary cilium in monociliated node cells (By similarity). Microtubule inner protein (MIP) part of the dynein-decorated doublet microtubules (DMTs) in cilia axoneme (By similarity). Belongs to the Flattop family.