Cell division. Coloured scanning electron micrograph (SEM) of a hepatocyte (liver cell) splitting into two new cells (cytokinesis). Here, this occurs soon after the nucleus of the old cell has split into two identical copies of itself by mitosis. Each new nucleus moves to an opposite end of the cell, and the central cytoplasm constricts, leaving a thin bridge. The bridge contracts under the influence of the structural protein actin, until it eventually breaks, leaving two independent cells, each identical to their parent. Hepatocytes form the bulk of the liver and, amongst other things, help to clean the blood. Magnification: x3,450 at 6x7cm size. x12,000 at 7x9.5ins

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