DON W. FAWCETT / SCIENCE PHOTO LIBRARY DON W. FAWCETT / SCIENCE PHOTO LIBRARY
Color enhanced Transmission Electron Micrograph (TEM) of surface mucous cells from a guinea pig's stomach. Such cells have large granules of varying shape. Their pleomorphism suggests that they have a malleable semisolid content, for fluid filled vesicles would be spherical or, if closely packed, polygonal. This degree of osmiophilia is unusual in a product rich in carbohydrate.
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