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Tetrahydrobiopterin (BH4) is an essential cofactor of nitric oxide synthase (NOS), but its function is not fully understood. Specifically, it is unclear whether BH4 participates directly in electron transfer. We investigated the redox properties of BH4 and several other pteridines with cyclic voltammetry and Osteryoung square wave voltammetry. BH4 was oxidized at a potential of +0.27 V vs normal hydrogen...
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