Fig. 7From: Direct activation of platelets by addition of CaCl2 leads coagulation of platelet-rich plasmaEffects of storage time on the coagulation pathway and platelets. Prothrombin time (a) and clot formation time (b) of citrated whole-blood samples stored for up to 6 days were examined simultaneously. Platelets’ responsiveness to Ca2+ was assessed by upregulation of CD62P (c) and CD63 (d) in CD41+ plateletsBack to article page