The figure above shows the top-view schematic map of extracellular domains of each transfected complex in experiments. Black circles represent GPIbα, green color represents the extracellular domain of GPIbβ and red color represents the extracellular domain of GPIX or convex loops derived from GPIX extracellular domain. The letters, a, b and c, mark the convex loops in the extracellular domains of GPIbβ and GPIX. Interface 1 and interface 2 between extracellular domains of GPIbβ and GPIX are noted in the first panel. The percentage of GPIbα fluorescence in each transfected complex versus that in transfected wild-type GPIb-IX complex is noted above each GPIbα subunit.