ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Cheek cells. Computer-enhanced light micrograph of squamous epithelial cells from the human mouth. These flat, scale-like cells have small oval nuclei and granular cytoplasm. 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. Cells such as these may be taken for genetic tests like DNA (deoxyribonucleic acid) fingerprinting. Magnification: x200 at 5x7cm size.
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