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Figure 3 Dose-dependent TRAP-induced platelet aggregation (percentage of light transmission in platelet-rich plasma) in 30 patients treated with aspirin 100 mg/day, clopidogrel 75 mg/day and aspirin 100 mg/day plus clopidogrel 75 mg/day. Results represent mean ± SEM. *p < 0.05 versus aspirin; #p < 0.05 versus clopidogrel (Wilcoxon signed rank test). TRAP = thrombin receptor agonist peptide.