LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Calcitonin hormone molecule. Computer model showing the structure of the human hormone calcitonin. Atoms are colour-coded spheres (carbon: dark grey, hydrogen: light grey, nitrogen: blue, sulphur: yellow, and oxygen: red). Calcitonin is a linear polypeptide that is produced primarily by parafollicular cells (C-cells) in the thyroid gland. It acts to reduce blood calcium levels by opposing the effects of parathyroid hormone (PTH).
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