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Figure 3 The effect of addition of fibrinogen, albumin and ferritin to blood on ADP-induced (average of results with all concentrations of ADP used) expression of P-selectin. Values are P-selectin expressed as a percentage of control values and are means ± SEM determined in blood samples from four subjects. Equimolar concentrations of albumin and ferritin were selected to permit determination of the specificity of results with the addition of 100 mg/dl, 200 mg/dl and 500 mg/dl of fibrinogen.