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Except for some of the originally studied enzymes such as pepsin, rennin, and trypsin, most enzyme names end in ase. The International Union of Biochemistry (I.U.B.) initiated standards of enzyme nomenclature which recommend that enzyme names indicate both the substrate acted upon and the type of reaction catalyzed.xcept for some of the originally studied enzymes such as pepsin, rennin, and trypsin, most enzyme names end in ase. The International Union of Biochemistry (I.U.B.) initiated standards of enzyme nomenclature which recommend that enzyme names indicate both the substrate acted upon and the type of reaction catalyzed.
Examples are pepsin, trypsin, and chymotrypsin which catalyzes the hydrolysis of proteins. The latest systematic nomenclature system known as the International Enzyme Commission (IEC) system is based upon the type of reaction catalyzed. There are six broad groups of enzymes in this system as shown in table on the left.