(B) Superimposition of the crystal structures of ARL3 (gray) in complex with its known interactors: the effectors UNC119A (salmon; PDB: 4GOJ15) and BARTL1 (yellow; PDB: 4ZI221), the GAP RP2 (orange; PDB: 3BH617), and GEF ARL13B (blue; PDB: 5DI319). On the right side is a zoomed-in view of the salt bridge between Glu86 and Arg148 at the CrARL13B-CrARL3 complex interface.