Component of the intraflagellar transport (IFT) complex B. Functions in regulating the cellular pool size of both complex A and complex B and thus plays a critical role in determining the cellular availability of IFT particles. Component of the IFT complex B, composed of IFT88, IFT70, IFT52, IFT46, IFT27, IFT25 and IFT22. Belongs to the small GTPase superfamily. Rab family. Although similar to the small GTPase superfamily, lacks the conserved catalytic Gln in position 67 which is replaced by a Ser residue, possibly explaining the weak GTPase activity. In contrast to other members of the family, it is not prenylated (PubMed:22076686) and unlikely to associate directly with membranes.