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Schematic vitamin B6 metabolism in humans. The diagram corresponds to the pyridoxal 5′-phosphate salvage pathway. PLP, pyridoxal 5′-phosphate; PNP, pyridoxine 5′-phosphate; PMP, pyridoxamine 5′-phosphate; PL, pyridoxal; PN, pyridoxine; PM, pyridoxamine; PDXK, pyridoxal kinase; and PNPO, pyridoxine 5′-phosphate oxidase.
