Mitosis. Fluorescence micrograph of a cell during metaphase of mitosis (nuclear division). During mitosis two daughter nuclei are formed from one parent nucleus. At metaphase, the chromosomes (green) line up along the centre of the cell, and the spindles (purple) grow from their poles to the centromeres (yellow), at the centre of each chromosome. Chromosomes are made up of two identical sister chromatids, which are separated into the two daughter nuclei, so that each daughter cell retains the parent cell's genetic information. Spindles are made of microtubules, protein filaments, which are part of the cell's cytoskeleton.
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