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Additional file 4: Movie S4. Time-lapse analysis of posterior view of embryogenesis in Astrephomene. Note the posterior gap surrounding by 4 cells (Fig. 2j; 1 pp, 2 pp, 1 pp’ and 2 pp’ cells) closed just after the sixth cell divisions. Scale bar: 5 μm, 900x speed. (AVI 2510 kb)
