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Figure 3 Tissue factor (TF) expression on monocyte membranes at baseline (A) and at the end of the perfusion (B). In two experiments monocytes were subjected to two-color analysis using TF-FITC as the abscissa and CD42b-PE as the ordinate: at baseline (C) there are some platelet-monocyte aggregates that do not display TF staining. At the end of the perfusion (D) only monocytes with attached platelets displayed TF staining.