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An Inactive Thyroid Gland in Carassius auratus P. Y. FORTUNE Department of Zoology, The University, Glasgow. Carassius auratus has been subjected to prolonged artificial selection which has established several unusual features. Among these is the inactivity of the thyroid gland. This gland consists of follicles scattered along the anterior region of the ventral aorta; the follicles are typically inactive, with squamous epithelium and abundant colloid.
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