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KEGG Orthology (KO) [BR:hsa00001]
  09120 Genetic Information Processing
    09123 Folding, sorting and degradation
      04120 Ubiquitin mediated proteolysis [PATH:hsa04120]
        10054 UBA2; ubiquitin like modifier activating enzyme 2	K10685 UBLE1B; ubiquitin-like 1-activating enzyme E1 B [EC:6.2.1.45]
  09180 Brite Hierarchies
    09182 Protein families: genetic information processing
      04121 Ubiquitin system [BR:hsa04121]
        10054 UBA2; ubiquitin like modifier activating enzyme 2	K10685 UBLE1B; ubiquitin-like 1-activating enzyme E1 B [EC:6.2.1.45]

Enzymes [BR:hsa01000]
  6. Ligases
    6.2  Forming carbon-sulfur bonds
      6.2.1  Acid-thiol ligases
        6.2.1.45  E1 ubiquitin-activating enzyme
          10054 UBA2; ubiquitin like modifier activating enzyme 2	K10685 UBLE1B; ubiquitin-like 1-activating enzyme E1 B [EC:6.2.1.45] 

Ubiquitin system [BR:hsa04121]
  Ubiquitin-activating enzymes (E1)
    UBL-activating enzymes
      10054 UBA2; ubiquitin like modifier activating enzyme 2	K10685 UBLE1B; ubiquitin-like 1-activating enzyme E1 B [EC:6.2.1.45]