STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Bone cancer cells. Coloured scanning electron micrograph (SEM) of bone cancer precursor cells (orange). These cells are monocytes, immune cells that circulate in the blood prior to entering tissues where they develop into macrophage cells. Several macrophage cells will later join together to form a large, multi- nucleated cell called an osteoclast. Osteoclasts are normally present in bones but can become cancerous. They can develop into a giant cell tumour (osteoclastoma) or osteosarcoma, a type of bone cancer that usually affects the ends of the long bones. Magnification: x3000 when printed at 10 centimetres wide.
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