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Figure 4 The effects of bradykinin (0.2, 0.6, 2.0 µg/min), acetylcholine (ACh) (30 µg/min) and papaverine (PA) (12 mg) on plasminogen activator inhibitor (PAI-1) antigen in the aorta (Ao) and coronary sinus (CS) in the angiotensin-converting enzyme inhibitor group (open box) and the nonangiotensin-converting enzyme inhibitor group (closed circle).