Tongue, light micrograph
Light micrograph of a section through a human tongue showing a salivary gland. Most of the gland is made up of mucus-secreting cells (blue). At bottom right is a small cluster of serous glands (pink) that secretes a fluid containing enzymes that start the digestion process. Magnification: x400 when printed at 15cm wide., Photo by EYE OF SCIENCE/SCIENCE PHOTO LIBRARY
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