Time-dependent CD62P surface expression and fibrinogen binding of platelets in citrated WB.

The histograms show the mean fluorescence intensities (MFI) of basal (white columns) and 10 μM TRAP-6 stimulated (shaded columns) CD62P expression (A) or fibrinogen binding (B) in fresh PB and in stored WB units at different time points as indicated. Results are presented in absolute arbitrary units (AU) as mean fluorescence ± SEM; n = 5; *: p < 0.05 (stimulated values compared to basal values); **: p < 0.05 (compared to PB and to WB at day 0).