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Enzymes
  Enzyme classes:
  EC 1: Oxidoreductases
    EC 1.1
    EC 1.2
    EC 1.3
    EC 1.4
    EC 1.5
    EC 1.6
    EC 1.7
    EC 1.8
    EC 1.9
    EC 1.10
    EC 1.11
    EC 1.12
    EC 1.13
    EC 1.14
    EC 1.15
    EC 1.16
    EC 1.17
    EC 1.18
    EC 1.19
    EC 1.20
    EC 1.21
    EC 1.97
    EC 1.98
    EC 1.99
      EC 1.99.1
      EC 1.99.2
  EC 2: Transferases
  EC 3: Hydrolases
  EC 4: Lyases
  EC 5: Isomerases
  EC 6: Ligases
  General information:
  Catalytic mechanism
  Enzyme kinetics
  Inhibitors
  Enzymes in industry

EC 1.99. Oxidoreductases that use oxygen (O₂ ) as oxidant

EC 1.99 subclass definition

The EC 1.99 subclass is now obsolete and used only for temporary enzyme classification.

Further classification of EC 1.99 subclass

EC 1.99.1 - Hydrolases, now reclassified as EC 1.14
EC 1.99.2 - Oxygenases, now reclassified as EC 1.13