EDHF is an unidentified mediator released from vascular endothelial cells in response to acetylcholine and bradykinin which is distinct from the NOS- (NO) and COX-derived (prostacyclin) vasodilators. CYP450 metabolism of PUFAs, produces epoxides such as (±)14(15)-EpETrE which are prime candidates for the actual active mediator. However, the CYP450 metabolites of EPA (Item No. 90110) and DHA (Item No. 90310) have been little studied relative to arachidonate epoxygenase metabolites. (±)14(15)-EpETE is the ω-3 homolog of (±)14(15)-EpETrE, derived via epoxidation of the 14,15-double bond of EPA. The EDHF activity of (±)14(15)-EpETE has not yet been determined.