Regulation of surface TLT-1 by thrombin. (A) Mouse platelets were stained with anti-CD41 or anti-CD62P as indicated and analyzed by FACS. Percentage of events in each quadrant is indicated. (B) Resting (left panels) or thrombin-stimulated (right panels) platelets were stained with anti-CD62P and anti–TLT-1 as indicated and analyzed by FACS.