Renin, also called an angiotensinogenase, is an aspartic protease protein and catalyst discharged by the kidneys that partakes in the body's renin–angiotensin–aldosterone framework (RAAS)— otherwise called the renin–angiotensin–aldosterone pivot—that intercedes the volume of extracellular liquid (blood plasma, lymph and interstitial liquid) and blood vessel vasoconstriction. In this manner, it controls the body's mean blood vessel circulatory strain. Renin can likewise be alluded to as a hormone, as it has a receptor, the (pro)renin receptor, otherwise called the renin receptor and prorenin receptor (see additionally underneath) just as enzymatic action with which it hydrolyzes angiotensinogen to angiotensin. The essential structure of renin forerunner comprises of 406 amino acids with a pre-and a star portion conveying 20 and 46 amino acids, separately. Develop renin contains 340 amino acids and has a mass of 37 kDa.