Expression of P-selectin (CD62P) mean fluorescence intensity (MFI) of monocytes with and without platelets bound, with and without the chemical platelet agonist TRAP-6 (positive control) in children and adults.

<p>Circulating MPAs in children had lower P-selectin expression than adults, but could be induced to express P-selectin by chemical stimulation. Data shown are mean MFI +/− SEM (adults n = 4 and children n = 4).