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parafollicular cell
Parafollicular cells (also called C cells) are neuroendocrine cells in the thyroid which primary function is to secrete calcitonin. They are located adjacent to the thyroid follicles and reside in the connective tissue. These cells are large and have a pale stain compared with the follicular cells or colloid. In teleost and avian species these cells occupy a structure outside of the thyroid gland named the ultimobranchial body.
==Structure==
Parafollicular cells are pale-staining cells found in small number in the thyroid and are typically situated basally in the epithelium, without direct contact with the follicular lumen. They are always situated within the basement membrane, which surrounds the entire follicle.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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