Movie I. The first zygotic cell division of the sea urchin embryo.

Movie II. Astral microtubule dynamics during anaphase and mitotic exit.

Movie III. Formation of secondary furrows in a binuclear, manipulated egg.

Movie IV. Fertilization is accompanied by a contractile wave that traverses the egg diameter.

Movie V. Asymmetric cytokinesis during the 4th and 5th cell divisions of sea urchin embryos.