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Thyroid gland follicle. Coloured transmission electron micrograph (TEM) of a follicle from the thyroid gland. The follicle consists of a layer of epithelial cells (pink) around a central storage chamber. The cells produce the thyroid hormones triiodothyronine (T3) and thyroxine (T4) and secrete them into the central chamber where they are store as the glycoprotein thyroid colloid (brown). The follicle is surrounded by blood vessels (red), which transport the hormones around the body. Thyroid hormones regulate the bodys metabolism.


Work by Steve Gschmeissner

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