MICHAEL ROSS / SCIENCE PHOTO LIBRARY MICHAEL ROSS / SCIENCE PHOTO LIBRARY
Light micrograph at 350x magnification of the parenchymal cells, essential cells, of the pineal gland, an organ found in most vertebrate brains that secretes the hormone melatonin (H&E stain). Pineal gland parenchymal cells are called pinealocytes and are arranged in clumps or cords. The micrograph also shows large densely stained hard masses of the pineal gland called brain sand or corpora arenacea.
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