2012/09/25 09:55

SEM

Caption: Scanning electron micrograph (SEM) of lymphocytic leukemia or chronic lymphocytic leukemia (CLL). CLL is a type of leukemia that affects the B cells, which are created in the bone marrow, and fight infection. The disease damages the B cells' DNA, rendering them incapable of fighting infection. These damaged B cells reproduce uncontrollably, crowding out otherwise healthy lymphocytes, thus compromising the body's ability to fight infection even further. The disease occurs only in adults who are over the age of 50.
Dividing brain cancer cells. Coloured scanning electron micrograph (SEM) of a cancerous astrocyte brain cell that has just undergone cytokinesis (cell division). The cells are still attached by a cytoplasmic bridge (lower right). Magnification: x4000 when printed 10 centimetres wide.
Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY


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