DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Colour enhanced transmission electron micrograph of an osteocyte (bone cell). It completely fills its lacuna. The clear area around the cell is occupied by collagen fibers and unmineralized matrix. The mineralized matrix is black, owing to electron scattering by the apatite crystals.
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