Notes: 12(S)-HHTrE is a product of the cyclooxygenase (COX) pathway and one of the primary arachidonic acid metabolites of human platelets.{567} It is biosynthesized by thromboxane (TXA2) synthase from prostaglandin H2 (PGH2) concurrently with TXA2. 12(S)-HHTrE is a natural lipid agonist of the leukotriene B2 receptor BLT2 in vivo that induces chemotaxis of mast cells and accelerates wound closure.{15587,26266} 12(S)-HHTrE is avidly oxidized to 12-oxoHTrE by porcine 15-hydroxy PGDH.{566}