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Proposed pathways for AsA metabolism. L-galactose pathway (I), D-galacturonic acid pathway (II), inositol pathway (III), L-gulose pathway (IV), degradation and cyclic regeneration pathway (V) of AsA metabolism, common in the synthetic pathway (VI). PME: Methylesterase; PMI: Mannose-6-phosphate isomerase; PMM: Phosphomannose mutase; GulDH: L-gulose-1,4-lactyl dehydrogenase; GR: Glutathione reductase.
