Figure S1. VWF string formation is independent of signaling pathways inducing pseudo-WPB exocytosis.

Figure S2. P-selectin is not required for VWF string formation.

Figure S3. Measurement of the exocytosis of pseudo-WPB.

Figure S4. Additional examples of platelet-decorated VWF strings anchored on the cell surface of HEK293 cells.

Video Clip S1. A platelet-decorated VWF string (bundle) remained on the cells surface more than 15 minutes under fluid flow.

Video Clip S2. Dynamics of VWF strings under flow.

Video Clip S3. Growth of VWF strings under flow.

Video Clip S4. VWF-GFP unfurled into strings and bound platelets at higher shear stress.

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