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Movie 4.

Knockdown of Dlg1 affects apical myosin contractions in the flanking cells. Ventral surface view of a control embryo and a dlg1 RNAi embryo expressing E-cadherin-GFP (magenta) and Sqh-mCherry (green) during late apical constriction. For each movie, two representative flanking cells are highlighted in magenta. T = 0:00 (mm:ss) corresponds to the onset of gastrulation.