Movie 1.

Cell dynamics in control, hoxb1b morphants, and hoxb7a-overexpressing embryos at the lateral blastoderm margin. Time-lapse movie visualizing cell contours in control (left), hoxb1b morphant (middle), and hoxb7a-overexpressing (right) embryos. Imaging was started at the 50% epiboly stage (cross-sectional view of lateral side). Intercellular spaces were labelled by injection of dextran mini-ruby at the 40% epiboly stage. Time interval, 3 min. Duration, 1 hour. Scale bar, 20 μm.