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The clinically relevant drug oltipraz (OPZ) has previously been shown to inhibit cytochrome P450 enzymes [Chem. Res. Toxicol. 13 (2000) 245]. The current study reveals that OPZ is also able to inhibit NO formation by purified inducible nitric oxide synthase (iNOS) but not by neuronal nitric oxide synthase in hemoglobin assays. The inhibition of iNOS by OPZ is reversible and competitive with...