Attachment of untreated, TNF-α–treated, and TNF-α + IFN-γ–treated HUVEC to WT-vWF in the presence of the GP Ibα MoAb AS-7. Attachment was determined at 60 minutes in the absence or presence of increasing amounts of the anti-GP Ibα AS-7 MoAb and compared with attachment to WT-vWF in the presence of control IgG1 (1:125 dilution).