Platelets express CD47. (A) Flow cytometric profiles of CD47 expression on platelets from CD47^-/- (filled curve), CD47^+/- (solid line), and CD47^+/+ mice (dotted line). (B) Comparison of CD47 expression levels on CD47^+/+ (CD47 wt; n = 9) and CD47^+/- (n = 6) platelets. Data are means ± SEMs. MFI indicates mean fluorescence intensity.