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Modifier JW: Used to report medicinal waste from single-dose vials or single-use packages

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Kynurenine is subsequently converted to NAD + in a chain of reactions with the rate-limiting step by quinolinic phosphoribosyltransferase (QPRT), which converts quinolinic acid into nicotinic acid mononucleotide (NAMN) 26 , finally entering the PreissHandler pathway
