Movie 5.

Mesendodermal cell alignment in wildtype explants. Maximum intensity projection of medium planes of high-resolution images of blastoderm explants (side views) obtained from Tg(sebox::EGFP) embryos expressing EGFP in mesendoderm progenitors at the onset of explant elongation (corresponding to embryonic shield stage). Mesendodermal cell boundaries within the explant extension are marked by clonal lifeact-RFP (grey) expression. Time is shown in minutes. Scale bar: 100 μm.