Light micrograph of a thyroid gland showing the follicles. The follicles are lined by a single layer of cuboidal epithelial cells (dark purple,dark nuclei),which synthesize 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 (purple),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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Biophoto Associates |
Taille de l’image : | 5130 px × 3408 px |
Model Release : | Non requis |
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