AAPP specifically inhibits collagen-induced platelet aggregation. PRP were incubated with 1000 nM rAAPP for 2 minutes followed by the addition of various platelet aggregation agonists, collagen (1.5 μg/mL), ADP (8 μM), TRAP (30 μM), epinephrine (0.5 μg/mL), PAF (0.125 μg/mL), U46619 (1 μM), and A23187 (20 μM). Tracings are representative results of a typical experiment.