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Figure 3 Effects of a balloon-induced, unilateral, controlled, graded stenosis (expressed as P_d /P_a ratio) on plasma renin concentration in the aorta (squares) , in the vein of the stenotic kidney (closed circles) , and in the vein of the non-stenotic kidney (open circles) . BL 1 = baseline before stenting; BL 2 = baseline after stenting; other abbreviations as in Figure 2 .