Transmission electron micrograph of cytokinesis

Transmission electron micrograph of cytokinesis

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Credit: DR GOPAL MURTI/SCIENCE PHOTO LIBRARY

Caption: Cell division. Transmission electron micrograph of the narrow bridge of cytoplasm (centre) between two separating cells. The dark areas contain chromosomes and will form the nuclei of the two daughter cells. Division of a cell's cytoplasm (cytokinesis) follows shortly after division of the nucleus (mitosis). A contractile ring of actin filaments gradually narrows the bridge between the two cells until it breaks the microtubule fibres of the spindle (parallel grey lines across bridge) and divides the cells. The spindle is involved in division of chromosomes during mitosis. This cell is from cultured human embryonic kidney tissue. Magnification x37,500 at 10x8 inch size.

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Keywords: cell division, cytokinesis, human body, microtubule, mitosis

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