Platelet adhesion on adsorbed A1. In all panels, 10 μg/ml A1 was
adsorbed onto the indicated surfaces. (a) Number of platelets binding at 2
dyne/cm2 for the indicated conditions. Mean ± SD, n = 2. (b) After platelets
bound to A1, flow was turned up or down every 30 s and the fraction of platelets remaining
bound was counted at each shear stress. Mean ± SD, n = 5. (c) In the same experiment, the
velocity of the bound platelets at each shear stress was calculated by tracking the
individual platelets. Mean ± SD, n = 5. In all panels, a p <0.05 is
indicated by * and a p <0.001 by **, for the unpaired one-sided
Students' t-test between the two data points indicated.