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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 1.21.3
      EC 1.21.4
      EC 1.21.99
    EC 1.97
    EC 1.98
    EC 1.99
  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 1.21. Synthesize X- Y bond from X- H and Y- H compounds

EC 1.21 subclass definition

The EC 1.21 subclass contains oxidoreductases which synthesize X-Y bond from X-H and Y-H compounds. Further classification is based on acceptor used in catalysis.

Further classification of EC 1.21 subclass

Further classification is based on acceptor used in catalysis

EC 1.21.3 - Acceptor is oxygen
EC 1.21.4 - Acceptor is disulfide
EC 1.21.99 - All other acceptors, also reserved for non classified enzymes