It is well known that arachidonic acid (AA) will be converted to EET by P450 arachidonic acid epoxygenase (AA epoxygenase) and EET will be converted to DHET by soluble epoxide hydrolase (sEH) in vivo. Cytochrome P450 2J2 (CYP2J2) is a predominant human AA epoxygenase that produces all four EETs. In human carcinoma cells, rAAV-mediated over expression of CYP2J2 resulted in a marked increase in 14,15-DHET level in cell plasma, whereas rAAV-anti2J2-mediated silence of CYP2J2 expression significantly decreased its production (1). The Eagle Biosciences 14, 15 EET/DHET ELISA Assay kit can be used to measure EET levels in cultured cells which express sEH (1).