GP6 and Stroke: Compared to controls, the stroke patients expressed significantly higher total GPVI (MFI±SD: control, 4.03±0.08; stroke, 4.30±0.32; P <0.0001) (Fig 1A) and GPVI-dimer (MFI±SD: control, 0.57±0.01; stroke, 0.63±0.05; P <0.0001) (Fig 1B).