Four-cell embryo

Four-cell embryo

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Caption: Cell division. Light micrograph of anaphase cell division (mitosis) in a sea urchin embryo (4- celled). Double nuclei (blue) containing genetic material can be seen in each cell. Anaphase is the fourth stage of mitosis, and is characterised by division of genetic material between two potential daughter cells. The nuclei are beginning to migrate to opposite ends of the cells, prior to the fifth (last) stage of mitosis when the cells will divide to form an 8-celled embryo. Mitosis has two functions: division of replicated genetic material, and cleaving of a cell into 2 identical daughter cells. Magnification: x250 at 6x7cm size.

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Keywords: 4-cell, anaphase, anatomy, animal body, egg, embryo, four cell, light micrograph, mitosis, sea urchin

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