Fig. 3. Overall view of Arl2-GTP:PDEδ and comparison with Rap1A-GppNHp:RafRBD and Cdc42-GDP:RhoGDI. (A) Ribbon diagram of the complex of Arl2-GTP and PDEδ, with color coding of Arl2 as in Figure 1B. (B) Complex of Rap1A-GppNHp and the Ras binding domain of Raf (Nassar et al., 1995). Color coding as in (A). (C) Complex of Cdc42-GDP and RhoGDI1 (Hoffman et al., 2000). Color coding as in (A). C-terminal geranylgeranyl modification is shown in light blue.