LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Parathyroid hormone molecule. Computer model showing the structure of parathyroid hormone (PTH), or parathormone. Atoms are colour-coded (carbon: dark grey, hydrogen: light grey, oxygen: red, and nitrogen: blue). PTH is secreted by the parathyroid glands in the neck. It acts to regulate the concentration of calcium and phosphorus in the blood.
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