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Biochemical pathway of vitamin C synthesis in animals vs. plants/green algae and humans. GDP-L-Gal phos, guanosine diphosphate-L-galactose phosphorylase; GalDH, galactose dehydrogenase; UDP-GlcDH, uridine diphosphate glucose dehydrogenase; GlcUA reductase, glucuronic acid reductase; GulL oxidase (GULO), L-gulonolactone oxidase. This figure is based on information from references [61,62,63,64,65].
