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Figure 1 Charts of conformationally active glycoprotein IIb/IIIa receptor expression (PAC-1) and anti-fibrinogen (Fg) before clopidogrel administration (T1), >2 h after clopidogrel (T2), and during eptifibatide infusion (T3). Receptor expression and Fg binding are expressed on the y axis as the mean number of sites expressed per platelet. ADP = adenosine diphosphate.