A cytochrome P450 monooxygenase involved in the metabolism of endogenous polyunsaturated fatty acids (PUFAs) and their oxygenated derivatives (oxylipins). Mechanistically, uses molecular oxygen inserting one oxygen atom into a substrate, and reducing the second into a water molecule, with two electrons provided by NADPH via cytochrome P450 reductase (CPR; NADPH-ferrihemoprotein reductase). Catalyzes the hydroxylation of carbon hydrogen bonds, with preference for omega-1 and omega-2 positions (PubMed:10791960, PubMed:16112640, PubMed:15789615). Hydroxylates (5Z,8Z,11Z,14Z)-eicosatetraenoic acid (arachidonate) predominantly at omega-2 position to form (18R)-hydroxyeicosatetraenoic acid (18R-HETE) (PubMed:10791960). Exhibits omega-1 hydroxylase activity toward prostaglandin (PG) H1, PGH2 and PGI2 (PubMed:10791960, PubMed:15789615). Catalyzes the epoxidation of double bonds of PUFAs, including docosahexaenoic and docosapentaenoic acids (PubMed:16112640). Shows little activity against PGD2, PGE1, PGE2, PGF2alpha, and leukotriene B4. an organic molecule + O2 + reduced [NADPH--hemoprotein reductase] = an alcohol + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (5Z,8Z,11Z,14Z)-eicosatetraenoate + O2 + reduced [NADPH--hemoprotein reductase] = (18R)-hydroxy-(5Z,8Z,11Z,14Z)-eicosatetraenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (4Z,7Z,10Z,13Z,16Z)-docosapentaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 20-hydroxy-(4Z,7Z,10Z,13Z,16Z)-docosapentaenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] O2 + prostaglandin H1 + reduced [NADPH--hemoprotein reductase] = 19-hydroxyprostaglandin H1 + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] O2 + prostaglandin H2 + reduced [NADPH--hemoprotein reductase] = 19-hydroxyprostaglandin H2 + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] O2 + prostaglandin I2 + reduced [NADPH--hemoprotein reductase] = 19-hydroxy-prostaglandin I2 + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 10,11-epoxy-(4Z,7Z,13Z,16Z,19Z)-docosapentaenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 13,14-epoxy-(4Z,7Z,10Z,16Z,19Z)-docosapentaenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 16,17-epoxy-(4Z,7Z,10Z,13Z,19Z)-docosapentaenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (4Z,7Z,10Z,13Z,16Z,19Z)-docosahexaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 19,20-epoxy-(4Z,7Z,10Z,13Z,16Z)-docosapentaenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (7Z,10Z,13Z,16Z,19Z)-docosapentaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 10,11-epoxy-(7Z,13Z,16Z,19Z)-docosatetraenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (7Z,10Z,13Z,16Z,19Z)-docosapentaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 13,14-epoxy-(7Z,10Z,16Z,19Z)-docosatetraenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (7Z,10Z,13Z,16Z,19Z)-docosapentaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 16,17-epoxy-(7Z,10Z,13Z,19Z)-docosatetraenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] (7Z,10Z,13Z,16Z,19Z)-docosapentaenoate + O2 + reduced [NADPH--hemoprotein reductase] = 19,20-epoxy-(7Z,10Z,13Z,16Z)-docosatetraenoate + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Lipid metabolism; fatty acid metabolism. Expressed in the epithelium of seminal vesicles, in renal cortex, in adult and fetal liver, in epidermis, in corneal epithelium, in sweat glands, hair follicles, epithelial linings of the ampulla of vas deferens and of the stomach and small intestine, as well as in the transitional epithelium of the bladder and ureter (at protein level). In the epidermis, expressed from the basal cell to the granular cell layers. In the corneal epithelium, expressed in all cell layers. Also detected in prostate. Up-regulated in the epidermis of psoriatic lesions. Belongs to the cytochrome P450 family.