MARY MARTIN / SCIENCE PHOTO LIBRARY MARY MARTIN / SCIENCE PHOTO LIBRARY
Colour enhanced, labelled composite of transmission electron micrographs showing the stages of mitosis in a human lymphocyte. Mitosis, the usual method of cell division, is characterized typically by the resolving of the chromatin (blue) of the nucleus into a threadlike form, which condenses into chromosomes, each of which separates longitudinally into two parts, one part of each chromosome being retained in each of two new cells resulting from the original cell. The four main phases of mitosis are prophase, metaphase, anaphase, and telophase.
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