Recombinant vWFs (WT, R543Q, and R543W) were coated to glass coverslips, which were preincubated with collagen type III. As a control, human albumin (HAS) was coated to collagen-treated coverslips. The coverslips were exposed to a shear rate of 1,600 s−1 using reconstituted platelets in vWF-depleted citrated plasma as the perfusate. The data are mean ± SEM obtained in three independent experiments each performed in triplicate.