Platelet aggregation with arachidonic acid and collagen. At each time point the results are shown for maximum % aggregation (mean ± SEM) with arachidonic acid (AA) and collagen (Col). Baseline (BL), after pioglitazone alone (Pio), after aspirin alone (ASA), and after both aspirin and pioglitazone (A+P). The numbers at the top of each bar represent the mean value.