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Pathway for the biosynthesis of UDP-2-acetamido-2,6-dideoxy-hexoses. 1, UDP-α-d-GlcNAc; 2, UDP-2-acetamido-2,6-dideoxy-β-l-arabino-4-hexulose; 3, UDP-2-acetamido-2,6-dideoxy-β-l-lyxo-4-hexulose; 4, UDP-β-l-RhaNAc; 5, UDP-β-l-QuiNAc; 6, UDP-β-l-PneNAc; 7, UDP-β-l-FucNAc. The bacterial enzymes involved in the different steps are indicated in italic type. From compound 2, a transamination reaction leads to the pseudamic acid pathway. For further details, see the Introduction.
