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Figure 1 Platelet aggregation (top: 5 µmol adenosine diphosphate [ADP]; middle: 20 µmol ADP) in patients with stent thrombosis (ST), control patients, and volunteers. Black boxes = acetylsalicyclic acid (ASA) (100 mg daily) alone; white boxes = ASA plus clopidogrel (75 mg daily). Platelet aggregation (bottom: 0.5 mg/ml arachionic acid) on ASA (100 mg daily) in patients with ST, control patients, and volunteers.