STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Lung cancer cell, coloured transmission electron micrograph (TEM). This cell has the typical morphology of a cancer cell. The nucleus (purple) is greatly enlarged and multilobed and the cytoplasm (yellow) contains many highly active mitochondria (dark purple dots) and lots of endoplasmic reticulum (ER, purple strands). Mitochondria produce energy for the cell and ER produced and modifies proteins. The nucleus contains chromatin (dark purple), a complex of DNA (deoxyribonucleic acid) and proteins. The most common cause of lung cancer is cigarette smoke. Magnification: x1900 when printed at 10 centimetres wide.
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