has_participant has participant cell activation platelet activation biological_process GO:0030168 A series of progressive, overlapping events triggered by exposure of the platelets to subendothelial tissue. These events include shape change, adhesiveness, aggregation, and release reactions. When carried through to completion, these events lead to the formation of a stable hemostatic plug. blood coagulation, platelet activation prothrombin (human) tyrosine-protein kinase Lck (human) tyrosine-protein kinase Fyn (human) tyrosine-protein kinase Lyn (human) proto-oncogene tyrosine-protein kinase Src (human) tyrosine-protein kinase receptor UFO (human)