Thyroid's two hormone-producing cell types develop separately before merging, study finds
The thyroid gland consists of two types of hormone-producing cells that regulate the body's metabolism and calcium balance. In mammals, these cell types merge into a single organ, whereas in other vertebrates, they develop into separate organs. How this fusion occurs has long remained unclear, even though developmental defects can lead to congenital abnormalities of the thyroid gland.
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