Video 1.
Part I: Cross-sectional (top) and ventral (bottom) views of 3D segmented ventral half of an embryo expressing GAP43::mCherry and imaged with SPIM. Each color marks a unique cell that is tracked in time. Part II: 3D volume rendering shown over time for three cells: one central and two (left and right) lateral mesodermal cells. The video illustrates the volume transited by the cells during ventral furrow formation. The tip of the left cell moved out of the imaging volume during the period. Apical side is up. Frame rate: 20 frames per second.