GDP-L-fucose biosynthesis via salvage pathway PMID:9804772 Biosynthesis of GDP-L-fucose from L-fucose, without de novo synthesis. In the salvage pathway, GDP-L-fucose is synthesized by the action of an L-fucose kinase and GDP-L-fucose pyrophospholylase from free fucose, which is delivered to the cytosol either extracellularly or intracellularly. GO:0042352 UPa:UPA00129 pathway nucleotide-sugar biosynthesis GDP-L-fucose biosynthesis