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Human urotensin-II (hU-II) is the most potent mammalian vasoconstrictor identified to date. Although it is expressed mainly in the brain and spinal cord, it is also detected in other tissues, such as the kidney. It has been speculated that U-II might be an important physiological mediator of vascular tone and blood pressure in humans. To our knowledge, no studies have investigated the level of U-II...