PROTEIN TRANSPORT, GOLGI APPARATUS, ER-GOLGI TRANSPORT, ARF, GTPASE, EFFECTOR, MYRISTATE, CYTOPLASM, NUCLEOTIDE-BINDING, ALTERNATIVE SPLICING, GTP-BINDING, PHOSPHOPROTEIN, HETEROTETRAMER, TRANSPORT, COILED-COIL, LIPOPROTEIN, COILED COIL CRYSTAL STRUCTURE OF THE ARF6 GTPASE IN COMPLEX WITH A SPECIFIC EFFECTOR, JIP4 2W83