STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Bone cell. Coloured scanning electron micrograph (SEM) of a freeze-fractured bone cell (osteocyte, white) surrounded by bone (brown). An osteocyte is called an osteoblast when it is forming bone. It produces osteoid, the organic bone matrix that is a mass of collagen fibres and glycoprotein cement. As soon as osteoid is formed, calcium salts crystallize inside it to form hard, mineralised bone. Magnification: x4000 at 6x7cm size.
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