Small GTPase-like component of the intraflagellar transport (IFT) complex B. Component of the IFT complex B, at least composed of IFT20, IFT22, HSPB11/IFT25, IFT27, IFT46, IFT52, TRAF3IP1/IFT54, IFT57, IFT74, IFT80, IFT81, and IFT88. Interacts with IFT88 (By similarity). Belongs to the small GTPase superfamily. Rab family.