Pancreatic juice is rich in the proenzymes of phospholipase A₂, which is converted to active form with the help of trypsin. Phospholipase A₂ converts the fatty acid at carbon 2 of the phospholipids, leaving a lysophospholipid. For example, lecithin is converted to lysolecithin. The remaining fatty acid at carbon 1 is cleaved by lysophospholipase, producing glycerylphosphorylcholine that is excreted into the faeces or further degraded and absorbed.