Immunogen sequence: LRVPVPPNVA FELDRTRADL ISEDVQRRFV QEVVQSQQVA VGRQLEDFRS KRLMGMTPWE QELAQLEAWV GRDRASYEAR ERHVAERLLM HLEEMQHTIS TDEEKSAAVV NAIGL. The Ras superfamily of GTPases, which can be subdivided into the Ras, Rho/Rac, Sar, Rab, ARF and Ran subfa