Movie 1.

Blastoderm and mesendoderm morphogenesis in wildtype explants. Maximum intensity projection of fluorescence/brightfield highresolution time-lapse imaging of blastoderm explants obtained from Tg(sebox::EGFP) embryos expressing EGFP (green) in mesendoderm progenitors from 24 minutes before the onset of extension (mbe). Time is shown in minutes. Scale bar: 100 μm.