BSIP / SCIENCE PHOTO LIBRARY BSIP / SCIENCE PHOTO LIBRARY
Fibroblast cell. Coloured transmission electron micrograph (TEM) of a section through a fibroblast cell (orange, centre) among a bundle of collagen fibres. Fibroblasts are fixed within a collagen matrix in the body's connective tissue, where they synthesize collagen and other important structural compounds. The cell seen here (orange, centre) has a central nucleus (blue) containing the genetic material. The collagen fibres surrounding the cell (red) have been cut crosswise and longitudinally. Also seen is part of an eosinophil white blood cell (orange, centre left) involved in the immune response. Magnification: x10,000 at 35mm size.
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