In the context of vascular smooth muscle cell (VSMC) proliferation, which is linked to progression of hypertension and atherosclerosis, resveratrol did not alter iNOS protein level, but it dose-dependently increased the level of iNOS activity, of iNOS cofactor BH4, and of guanosine triphosphate cyclohydrolase I protein, the rate-limiting enzyme in BH4 biosynthesis [100]. The gene discussed is NOS2; the disease is atherosclerosis.