Cytochrome P450 11B2, mitochondrial (EC1.14.15.4, EC1.14.15.5; UniProt P19099; also known as ALDOS, Aldosterone synthase, Aldosterone-synthesizing enzyme, CYPXIB2, Cytochrome P-450Aldo, Cytochrome P-450C18, Cytochrome P450 subfamily XIB polypeptide 2, Steroid 11-beta-monooxygenase, Steroid 11-beta/18-hydroxylase, Mitochondrial cytochrome P450 family 11 subfamily B polypeptide 2) is encoded by the CYP11B2 (Also known as CPN2, CYP11B, CYP11BL, P450C18) gene in human (Gene ID 1585). CYP11B2 protein is a member of the cytochrome P450 superfamily of monooxygenases that catalyze reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. CYP11B2 protein is localized to the mitochondrial inner membrane and exhibits steroid 18-hydroxylase activity and steroid 11 beta-hydroxylase activity. CYP11B2 gene mutations are known causes of corticosterone methyl oxidase 1 (CMO-1) deficiency, an autosomal recessive disorder of aldosterone biosynthesis.