MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Cheek cells. Light micrograph of two flat, scale-like squamous epithelial cells and bacteria from the human mouth. The epithelia are tissues that cover all body surfaces, cavities and tubes apart from the blood and lymph vessels. Epithelial cells form a protective layer within the mouth. The mouth contains a large number of bacteria, most of which are harmless or even beneficial. However, some bacteria can cause throat infections or cause the formation of plaque deposits on the teeth, which may lead to decay. Magnification: x1000 when printed at 10cm wide.
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