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Table 2 Statistics on EC numbers held in the database.

From: ExplorEnz: a MySQL database of the IUBMB enzyme nomenclature

  Class 1 (Oxidoreductases) Class 2 (Transferases) Class 3 (Hydrolases) Class 4 (Lyases) Class 5 (Isomerases) Class 6 (Ligases) All classes
Current 1,108 1,162 1,111 356 160 139 4,036
Transferred 146 48 276 63 3 1 537
Deleted 60 57 98 21 7 4 248
Total 1,253 1,208 1,382 416 163 140 4,821