The enzyme phospholipase A2 catalyse the cleavage of fatty acids in position 2 of phospholipids, hydrolyzing the bond between the second fatty acid “tail” and the glycerol molecule: phosphatidylcholine + H2O = 1-acylglycerophosphocholine + a carboxylateThis particular phospholipase specifically recognizes the sn2 acyl bond of phospholipids and catalytically hydrolyzes the bond, releasing arachidonic acid and lysophosphatidic acid. Wikipedia