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Proposed biosynthesis pathway to GDP-N-formylperosamine in Y. enterocolitica O:9. The pathway up to GDP-4-keto-6-deoxy-d-mannose is identical to that of GDP-l-fucose biosynthesis; both Fcl (GDP-l-fucose synthetase) and Per (GDP-d-perosamine synthase) use this intermediate as a substrate.
