LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Parathyroid hormone. Molecular model showing the primary structure (spheres) and secondary structure (coils) of parathyroid hormone (PTH), or parathormone, which is secreted by the parathyroid glands in the neck. The hormone acts to regulate the concentration of calcium and phosphorus in the blood.
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