Coloured transmission electron micrograph (TEM) of a transverse section through a Fusobacterium nucleatum bacterium. In this section the internal structures of the cell resemble a 'face': the 'eyes' (blue) are intracellular granules; the 'mouth' (red) contains cytoplasm and is shaped by a cell membrane. Many such membranes make up the cell wall. Fusobacterium nucleatum typically are long, anaerobic, rod-shaped bacteria, tapered at both ends. They occur in the dental plaque that forms on the surface of teeth. These bacteria ferment carbohydrates to lactic acid; plaque is a cause of periodontal disease and tooth decay in humans. Magnification: x67, 200 at 6x4.5cm size.

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