Several cytochrome P450s (CYPs) convert arachidonic acid to 5,6-epoxyeicosatrienoic acid (5,6-EET). The CYPs and their references are as follows: CYP1A1, CYP1A2, CYP1B1 (Choudhary et al. 2004); CYP2J2 (Wu et al. 1996).
monooxygenase activity of CYP(4) [endoplasmic reticulum membrane]