Fig. 3. Platelet aggregation in whole blood after chronic treatment. Inducers: 2.5 μm adenosine diphosphate (ADP) ( A ), 1 μg/ml collagen ( B ), or 400 μm arachidonic acid ( C ). Treatments: aspirin (100 mg/day) or S (+)-ibuprofen (dexibuprofen, 800 mg/day). Sample: healthy volunteers (n = 12). Each point is mean ± SD of the data. * P < 0.05 with respect to the aspirin value.