Video images of L-cell rolling on purified vWF at a wall shear stress of 10 dyn/cm². Images were created using a digital image processing system to snap frames of previously recorded experiments. LβIX cells (A) and LβIXV cells (C) were introduced into the chamber and allowed to incubate for 1 minute before the initiation of flow. After 30 seconds of flow, LβIX cells (B) had been swept away from the vWF surface, whereas LβIXV cells (D) rolled maintaining continuous surface contact. Images of rolling cells were created by snapping 30 frames per second and overlapping all 30 frames.