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Paneth cell from the small intestine, transmission electron micrograph (TEM). The cell contains a nucleus (round, lower right) and numerous protein- containing vesicles (black). Paneth cells are found in the lining of the small intestine, and are part of the body's defences against pathogens. In the presence of bacteria, fungi or other pathogens, they secrete a variety of small proteins from the vesicles. These disrupt the cell membranes of the pathogens, leading to their death. Magnification: x3670 when printed 10 centimetres high.
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