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Figure 4 Forearm blood flow (FBF) percent increase above basal induced by acetylcholine (upper panels) and bradykinin (lower panels) during saline or sulfaphenazole, at baseline (control) and under vitamin C in essential hypertensive patients. Data shown as mean ± SEM. *p < 0.05; p < 0.01 (by analysis of variance for repeated measures and Scheffé’s test).