with protein synthesis. As in many endocrine organs, with age, more oxyphil cells appear in the parathyroid gland. Parathyroid tissue seems to have a low turn-over rate.

Chief cells appear as a dark purple in an H&E stain, with the oxyphil cells staining as a lighter pink. They are polygonal in shape with a round nucleus.

Chief cells spend most time inactive due to normal calcium level conditions. These inactive cells are classified as cuboidal. They have low levels of secretory granules, as opposed to active chief cells. These

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