Movie 1

Time-lapse movie of the PSM and tailbud of the 17 somite stage embryo shown in Figs. 1 and 2. Slices of the stacks (z = 18/24) were used to make the Quick time movie file. The actual image size is 512×512×24 voxels. The spatial resolution (voxel size) of the image is 0.692×0.692×1.75 (μm³). The frame interval is 0.83 min.