COX called also as prostaglandin endoperoxidase synthase is a membrane—bound hemoprotein and glycoprotein enzyme that catalyzes conversion of cell membrane phospholipids, involved in the synthesis of prostanoids comprising: prostaglandin (PG), prostacyclin (PGI) and the thromboxanes (TXA) and exists as 3 isoforms (COX-1, -2 and -3).
Source: wiktionary