Morphogenesis of the ventral yolk syncytial layer (YSL) from sphere stage to the end of gastrulation. The last round of nuclear division occurs before marginal band contraction and epiboly begins. As ...

Polarized cell rearrangement in the Platynereis neuroectoderm visualized by time-lapse imaging. This time-lapse movie shows convergent extension by mediolateral cell intercalation of the ventral neuro...