Trypsin is a serine protease found in the digestive system, where it breaks down proteins. Trypsin predominantly cleaves peptide chains at the carboxyl side of the amino acids lysine and arginine, except when either is followed by proline. It is used for numerous biotechnological processes. The process is commonly referred to as trypsin proteolysis or trypsinisation. Chemistry and function Trypsin is secreted into the duodenum, where it acts to hydrolyse peptides into its smaller building block… (More on Trypsin)