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Figure 3 Aggregation (mean percent ± SEM) with adenosine diphosphate (ADP) (A) or collagen (B) dichotomized according to the Pl^A genotype. There is a significant interaction between agonist concentration and indicated Pl^A genotype for aggregation induced with ADP (A, p < 0.005) and collagen (B, p = 0.005). Multiple comparisons (six included in adjustment per plot) at each agonist’s concentrations revealed significant differences (p < 0.05) between Pl^A1/A1 and Pl^A1/A2 as indicated. *Applies for differences between Pl^A1/A1 and Pl^A1/A2.