Movie 6

Asymmetric divisions in outer cell population (in wt3). An outer cell (blue-green) undergoes an asymmetric division and displays a prophase pattern by 91.75 h.p.f. 15 minutes later, the metaphase plate is parallel to the imaging plane. The mitotic cell gives rise to an outer daughter (blue-green, right side of the movie) and an inner daughter (yellow, left side of the movie) by 92.25 h.p.f. 60 minutes later, the inner nucleus has reached the inner cell mass. Scale bar: 25 μm.