Fig. 4. Involvement of Rac but not Cdc42 in MIM-B-induced actin cytoskeletal reorganisation. A construct encoding myc-MIM-B was co-microinjected with constructs expressing either the FLAG-tagged dominant negative form of Rac (N17 Rac, A-C) or Cdc42 (N17 Cdc42, D-F). Cells were treated as described in Fig. 3. Bar, 20 µm.