ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Vasopressin hormone crystals, light micrograph taken with polarised light. Vasopressin is a neurohypophysial hormone found in most mammals, controlling the reabsorption of water molecules in the kidney tubules. Also it constricts blood vessels, raises blood pressure, and reduces excretion of urine. Also called antidiuretic hormone. Object-size across: 3 mm.
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