NeopterinBiopterinPteridinesPterinsGTP CyclohydrolaseDihydropteridine ReductasePhosphorus-Oxygen LyasesPhenylketonuriasDystonia Musculorum DeformansAminopterinPhenylalanine HydroxylasePhenylalanineMeningitis, Escherichia coli5-HydroxytryptophanNitric Oxide SynthaseHypoxanthinesChromatography, High Pressure LiquidBiological MarkersAlcohol OxidoreductasesBiological AssayKynurenine