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Figure 1 Absolute change in mean luminal diameter of the left anterior descending artery (LAD) coronary artery during intracoronary infusions. Ach–5 and Ach–4 indicate intracoronary acetylcholine infusions, 10–5 and 10–4 mol/liter, respectively.  = Nitroglycerin group.  = Nonnitroglycerin group. *p < 0.01 versus morning control;  p < 0.01 versus afternoon control;  p < 0.01 versus morning Ach–4;  p < 0.01, GTN group versus non-GTN group.
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