The Renin reference article from the English Wikipedia on 24-Apr-2004
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Renin

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Renin is a hormone released by the kidneys in response to low blood volume, or low body NaCl content. Renin activates the renin-angiotensin system and ultimately constricts blood vessels, leading to increased blood pressure.

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Renin acts on angiotensinogen to produce angiotensin I.