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Figure 2 Percent inhibition by sulfaphenazole on maximal response to acetylcholine (Ach) or bradykinin (Bdk) in normotensive subjects and essential hypertensive patients in control condition (saline) and under vitamin C. Data shown as mean ± SEM. *p < 0.001 versus other groups; p < 0.05 versus Ach under saline in hypertensive patients (by analysis of variance and Scheffs test).