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Hierarchical classifications of enzymes by the NC-IUBMB Enzyme List. Enzymes are given IDs, namely the Enzyme Commission (EC) numbers, consisting of four digits connected by dots (e.g., EC 1.1.1.1). The first digit represents one of the six classes, 1. oxidoreductases, 2. transferases, 3. hydrolases, 4. lyases, 5. isomerases, and 6. ligases. The second and third digits represent more detailed classification. The classification criteria are different dependent on the classes.
