2: R= CH20H 12, ZO-dlHETE arachidonic acid by a 12-lipoxygenase enzyme, which is found in platelets' and skin, keratinocytes. 2 The 12-HETE is of particular interest since it has been detected in high concentrations in psoriatic lesions3 and has been shown to possess both chemotactic and chemokinetic properties. The 12 (S)-HETE is also the major lipoxygenase-derived arachidonic acid metabolite produced by the platelet and has been ...