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Thyroid follicles, light micrograph

Thyroid follicles, light micrograph

C015/1756

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Credit

OVERSEAS / COLLECTION CNRI / SCIENCE PHOTO LIBRARY OVERSEAS / COLLECTION CNRI / SCIENCE PHOTO LIBRARY

Caption

Thyroid follicles. Light micrograph of a section through a thyroid gland showing the follicles. The follicles are lined by a single layer of cuboidal epithelial cells, which synthesise and secrete the iodine-containing hormones T3 (tri-iodothyronine) and T4 (thyroxine). The thyroid follicle is filled with a glycoprotein substance called thyroglobulin or thyroid colloid (red), which is a storage form of the thyroid hormones. When actively secreting hormones the lining cells are large and cuboidal, when less active the follicles are distended and the secretory cells flattened.

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Model release not required. Property release not required.

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