STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Bacteria in the nose. Coloured scanning electron micrograph (SEM) of bacteria (orange) on the surface of the nasal cavity. Mucus, secreted by cells in the lining of the nose, traps foreign objects, such as bacteria, preventing them from entering the lungs. Magnification: x2000 when printed 10 centimetres wide.
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