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Figure 2 Percent change in mean luminal diameter of the left anterior descending artery (LAD) coronary artery from baseline, in response to maximal intracoronary acetylcholine infusion (10–4 mol/liter). *p < 0.01 versus morning control;  p < 0.01 versus afternoon control;  p < 0.05, response in GTN group versus non-GTN group.  = Nitroglycerin group.  = Nonnitroglycerin group.
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