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Prothrombin time (PT) in relation to the amount of erythrocyte microparticles (EMPs) added to the assay. The more EMPs were added, the shorter the PT. EMPs were isolated from erythrocyte concentrates, and different amounts were added to citrated plasma. Calcium was added to start the reaction (but no tissue factor or thromboplastin). Data are presented as mean ± standard deviation of 5 independent measurements.
