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Clot retraction with different anticoagulants: Clot retraction was induced by incubating PRP with 100 U of human α-thrombin for 2 hrs at 37 °C using citrate, PPACK, or heparin as an anticoagulant. The percentage of clot retractions showed no significant differences between the three anticoagulants (one-way ANOVA, n = 14/group).
