The division furrow of a dividing Didinium. A thick layer of epiplasm coated on the cytosolic side by mitochondria forms the constricting ring in the furrow. As usual mucocysts lie between the epiplas...

The division furrow of a dividing Didinium. A thick layer of epiplasm coated on the cytosolic side by mitochondria forms the constricting ring in the furrow. As usual mucocysts lie between the epiplas...

The new oral region in the opisthe starts to form as an unorganized field of new basal bodies develops at the equator of the cell surface. At first these do not resemble membranelles although some bas...

The new oral region in the opisthe starts to form as an unorganized field of new basal bodies develops at the equator of the cell surface. At first these do not resemble membranelles although some bas...

16-cell purple urchin embryo expressing three tandem GFPs fused to the ensconsin microtubule-binding domain (EMTB-3G; Faire et al., 1999). 10 µM nocodazole was added at time 00:00. The top left cel...

Scanning electron microscope image of Lytechinus pictus [sea urchin] embryo at the 2-cell stage. The fertilization envelope has been removed to reveal the cells covered with a dense meshwork of the hy...

Microtubules in sand dollar embryo expressing three tandem GFPs fused to the ensconsin microtubule-binding domain (EMTB-3G; Faire et al., 1999). Eight-cell sand dollar embryo; single microtubules gro...

Eight-cell purple urchin embryo expressing three tandem GFPs fused to the ensconsin microtubule-binding domain (EMTB-3G; Faire et al., 1999). The embryo was treated with 20 µM nocodazole at time 00:...

Transmission electron micrograph of cell division in an insect spermatocyte captured in late anaphase - telophase with cytokinesis in progress. The homologous chromosomes appear as darkly stained disc...

First cleavage of a live mouse zygote. Clear circles are the nuclei which are in a sea of granule dense yolk. The band around the two cells is the zona pellucida.