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Inner-outer lineage segregation

Filopodia retracting before division

Actin rings expanding over embryo surface

Actin rings zippering, driving embryo sealing

Sister cells remain connected by microtubule bridge after division

Bridges serve as sites of microtubule growth (MTOCs)

Nuclear bouncing triggering apical polarization

Myosin II imaging shows sites of nuclear bouncing

Video summary from White et al. Cell (2013)

Cell dynamics in vivo

Electron microscopy of the embryo in 3D

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