A new form of cell division, klerokinesis, causes a cell to divide into two daughter cells. Klerokinesis differs from the normal cell division, called cytokinesis. The discovery may lead to techniques to prevent some cancers from developing.
Here the early blastula of the sand dollar (Dendraster excentricus) is imaged with laser scanning confocal microscope (Olympus FluoView FV1000). Antibody to tubulin labels mitotic spindles, and the false-coloring scheme mitigates the dramatic intensity difference between the bright, dense microtubule bundles of the spindle itself and the comparatively insubstantial astral microtubules radiating in all directions toward the cortex from each spindle pole.
The seminferous tubule also contains Sertoli cells (green) embedded between the differentiating sperm cells (red). Sertoli cells nurture the developing sperm cells by secreting hormones and proteins required for spermatogenesis. Sertoli cells also establish and maintain the stem cell niche to ensure renewal of sperm cell precursors.