Movie 1. QuickTime Movies 1A-D show the time-lapse images corresponding to Fig. 5A-D. Time-lapse images were captured for Movie 1A, every 20 seconds for 20 minutes; for Movie 1B, every 10 seconds for 30 minutes; for Movie 1C, every 20 seconds for 30 minutes; and for Movie 1D, every 30 seconds for 30 minutes.

Movie 2. QuickTime Movies 2A-D show cells corresponding to those captured in Fig. 6A-D for FRAP analysis. Movie 2D (EGFP alone) shows sequential images captured before bleaching and for every second for the first 10 seconds after photobleaching. Movies 2A-C (EGFP-RUNX fusion proteins) show sequential images captured before bleaching and every second for 45 seconds after photobleaching.