THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY THOMAS DEERINCK, NCMIR / SCIENCE PHOTO LIBRARY
Villi in the small intestine, fluorescent light micrograph. Villi are finger-like projections from the inner lining of the small intestine that serve to increase the surface area available for absorption of nutrients from food. Each villus has a red outer layer surrounding blood vessels that carry the nutrients into the bloodstream. Cell nuclei have been stained green.
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