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Figure 4 Collagen-stimulated Pl^A1/A1 platelets were significantly more inhibited by acetylsalicylic acid (aspirin) than Pl^A1/A2 platelets (p < 0.0001) as assessed by fluorescein isothiocyanate-fibrinogen binding (mean fluorescence units ± SEM). Multiple comparisons (six included in adjustment per plot) at each concentrations of collagen revealed significant differences (p < 0.05) between Pl^A1/A1 and Pl^A1/A2 platelets as indicated. *Applies for differences between Pl^A1/A1 and Pl^A1/A2.