MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Prophase cell division. Light micrograph of prophase mitosis (cell division) in a sea urchin embryo. Nuclei (blue) can be seen in both cells, and microtubules (clear filaments) are extending away from the nuclei. Prophase is the second of 5 stages in mitosis, it begins when chromosomes (genetic material) become visible in the nucleus. Mitosis has two functions: division of genetic material between the two potential cells, and the cleaving of the dividing cell into two identical daughter cells. Magnification: x250 at 6x7cm size.
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