Increased concentrations of free arachidonic acid, prostaglandins E2 and F2α, and of 12L-hydroxy-5,8,10,14-eicosatetraenoic acid (HETE) in epidermis of psoriasis: evidence for pertur- o bated regulation of arachidonic acid levels in psoriasis - Hammarrstrøm, S; Hamberg, M; Samuelsson, B; Duell, E A; Stawiski, M; Voorhees, J J (Proc Natl Acad Sci USA, 1975)