). Rab proteins (i.e. RAB3B, RAB13, and RAB8 (RAB8A)), another small GTPase subfamily that belongs to the Ras superfamily, are localized at the cell–cell interface in epithelial cells ( Huber et al . 1993 , Weber et al . 1994 , Zahraoui et al . 1994
). Rab proteins (i.e. RAB3B, RAB13, and RAB8 (RAB8A)), another small GTPase subfamily that belongs to the Ras superfamily, are localized at the cell–cell interface in epithelial cells ( Huber et al . 1993 , Weber et al . 1994 , Zahraoui et al . 1994