Thyroid follicles, light micrograph
Light micrograph of thyroid follicles. The thyroid gland is composed of follicles (roughly round large structures) filled with colloid substance (pink) and lined by follicular cells (blue dots). A few blood vessels (bright red) are also seen in this image in between the follicles. Haematoxylin and eosin stained tissue section. Magnification: 400x when printed at 10cm., by ZIAD M. EL-ZAATARI/SCIENCE PHOTO LIBRARY
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