MICHAEL ROSS / SCIENCE PHOTO LIBRARY MICHAEL ROSS / SCIENCE PHOTO LIBRARY
Light micrograph at 45x magnification, showing an adult human parathyroid gland (H&E stain). The parenchyma, essential elements, of the gland consists of two cell types - the principal cells, which are basophilic, easily stained by basic dyes, and the oxyphil cells that have a more prominent eosinophilic, easily stained by eosin or other acid dyes, cytoplasm. Connective tissue containing blood vessels sits between the lobes of the gland.
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