Movie 5.

Myosin II is transiently stabilized during the initiation of the AP boundary. Time-lapse movies of FRAP experiments showing histoblasts expressing Sqh-GFP at the three developmental phases. Sqh-GFP was photobleached at AP cell junctions or at cell junctions within a compartment, as indicated. Time relative to photobleaching is shown. Colors indicate pixel intensities of Sqh-GFP (see Fig. 5B-G). Scale bars are 5 μm.