DR PAUL ANDREWS, UNIVERSITY OF DUNDEE / SCIENCE PHOTO LIBRARY DR PAUL ANDREWS, UNIVERSITY OF DUNDEE / SCIENCE PHOTO LIBRARY
Mitosis. Fluorescence micrograph of two cells during mitosis (nuclear division), when two daughter nuclei are formed from one parent nucleus. The cell on the left is at the prometaphase stage, while the cell on the right is in metaphase. During prometaphase, the nuclear envelope breaks down, allowing the mitotic spindle (red) to interact with the chromosomes (white). At metaphase, the chromosomes line up along the centre of the cell, and the spindles grow from each pole to the chromosomes. Chromosomes are made up of two identical sister chromatids, which are separated into the two daughter nuclei, so that each new cell retains the parent cell's genetic information.
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