kidney protein/peptide composition measurement kidney renin level 2014-02-03T17:55:31Z CMO:0002166 JSmith The amount of renin in a specified sample of kidney tissue. Renin, an aspartyl protease, catalyzes the cleavage of angiotensinogen to form angiotensin I, the first step in the activation pathway of angiotensinogen--a cascade that can result in aldosterone release,vasoconstriction, and increase in blood pressure. VT:0010559 clinical_measurement_ontology kidney REN level kidney renin protein level