Renin, a proteolytic enzyme formed in the granules of the juxtaglomerular apparatus cells, catalyzes conversion of the protein angiotensinogen to angiotensin I, a decapeptide.

是旁体细胞颗粒内形成的一蛋白水解酶，催化蛋白血管原转换为血管Ⅰ，即十肽。