SEARCH Articles Figures Tables 6- -tetrahydrobiopterin Activated oxidation Activation oxidation Active oxides Activity oxidation Nitric oxide activity Nitric oxide synthase Nitric oxide synthase activation Nitric oxide synthases Nitric synthase Nitric-oxide synthases activation Nitric-oxide synthases activity Oxidative activation Oxides activated Oxidizing activators Tetrahydrobiopterin nitric oxide synthase