Immunofluorescent micrograph of sea urchin mitosis

Immunofluorescent micrograph of sea urchin mitosis

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Caption: Mitosis. Immunofluorescence micrograph of a newly fertilized sea urchin embryo during the metaphase of mitosis (division of the nucleus). This cell is about to divide into two. The chromosomes (blue) have aligned in a band across the middle of a "spindle" of fibres called microtubules (green). These will pull the chromosomes apart into two identical sets to form the nuclei of the daughter cells. The bright green bodies at left and right are the poles of the spindle, or centrioles. This picture was made by treating the cell with fluorescent antibodies that bind to specific proteins. The image was then captured by a laser- scanning light microscope. Magnification unknown.

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Keywords: 1-cell stage, animal cell division, cell division, centriole, embryo, metaphase, mitosis, mitotic, sea urch, sea urchin, spindle, zygote

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