Enzymes are proteins that catalyze most of the chemical reactions that take place in the body. The chemical compound upon which the enzyme exerts its catalytic activity is called a substrate. Proteolytic enzymes degrade their substrates, proteins and peptides, by hydrolyzing one or more peptide bond(s). For information on enzyme kinetics, see the Chromogenix Catalog or contact Diapharma Group, Inc. at info@diapharma.com.