Expression of P-selectin (CD62) on GPVI-deficient platelets and control platelets induced by (A) collagen type I and (B) CRP-XL, measured by flow cytometry using FITC-labeled anti-CD62 antibody. Neither collagen nor CRP-XL induced CD62 expression on GPVI-deficient platelets. Fluorescence of unstimulated control platelets is defined as 1. Data shown are representative of two similar experiments.