PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY PASCAL GOETGHELUCK / SCIENCE PHOTO LIBRARY
Mitosis. Fluorescence micrograph of a cell during the metaphase stage of mitosis (cell division). During mitosis, two daughter nuclei are formed from one parent nucleus in a cell. This requires organisation of the chromosomes (blue) and mitotic spindles (green) to ensure that each cell retains an exact copy of the parent cell's genetic information. At metaphase the cell chromosomes form a line and the spindles form a symmetrical structure either side, ready to pull the two copies apart.
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