BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Thyroid nodule. Light micrograph of a section through a microfollicular adenoma, or nodule, in a thyroid gland. The nodule is filled with small closely-packed follicles containing the hormone storage glycoprotein colloid (pink). The nodule can lead to an enlargement of the thyroid gland and overproduction of thyroid hormone.
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